diff --git a/.dockerignore b/.dockerignore
index b2a9091..a9f7bc4 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,5 +1,4 @@
 # Exclude a bunch of stuff which can make the build context a larger than it needs to be
-.git/
 tests/
 build/
 lib/
diff --git a/README.md b/README.md
index 4bae8a4..7ee8b21 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 This project is built using [react-admin](https://marmelab.com/react-admin/).
 
-It needs at least Synapse v1.14.0 for all functions to work as expected!
+It needs at least Synapse v1.15.0 for all functions to work as expected!
 
 ## Step-By-Step install:
 
diff --git a/src/App.js b/src/App.js
index c8cc6aa..d92ec30 100644
--- a/src/App.js
+++ b/src/App.js
@@ -48,6 +48,7 @@ const App = () => (
       icon={RoomIcon}
     />
     <Resource name="connections" />
+    <Resource name="devices" />
     <Resource name="servernotices" />
   </Admin>
 );
diff --git a/src/components/devices.js b/src/components/devices.js
new file mode 100644
index 0000000..ee9292c
--- /dev/null
+++ b/src/components/devices.js
@@ -0,0 +1,89 @@
+import React, { Fragment, useState } from "react";
+import {
+  Button,
+  useMutation,
+  useNotify,
+  Confirm,
+  useRefresh,
+} from "react-admin";
+import ActionDelete from "@material-ui/icons/Delete";
+import { makeStyles } from "@material-ui/core/styles";
+import { fade } from "@material-ui/core/styles/colorManipulator";
+import classnames from "classnames";
+
+const useStyles = makeStyles(
+  theme => ({
+    deleteButton: {
+      color: theme.palette.error.main,
+      "&:hover": {
+        backgroundColor: fade(theme.palette.error.main, 0.12),
+        // Reset on mouse devices
+        "@media (hover: none)": {
+          backgroundColor: "transparent",
+        },
+      },
+    },
+  }),
+  { name: "RaDeleteDeviceButton" }
+);
+
+export const DeviceRemoveButton = props => {
+  const { record } = props;
+  const classes = useStyles(props);
+  const [open, setOpen] = useState(false);
+  const refresh = useRefresh();
+  const notify = useNotify();
+
+  const [removeDevice, { loading }] = useMutation();
+
+  if (!record) return null;
+
+  const handleClick = () => setOpen(true);
+  const handleDialogClose = () => setOpen(false);
+
+  const handleConfirm = () => {
+    removeDevice(
+      {
+        type: "delete",
+        resource: "devices",
+        payload: {
+          id: record.id,
+          user_id: record.user_id,
+        },
+      },
+      {
+        onSuccess: () => {
+          notify("resources.devices.action.erase.success");
+          refresh();
+        },
+        onFailure: () =>
+          notify("resources.devices.action.erase.failure", "error"),
+      }
+    );
+    setOpen(false);
+  };
+
+  return (
+    <Fragment>
+      <Button
+        label="ra.action.remove"
+        onClick={handleClick}
+        className={classnames("ra-delete-button", classes.deleteButton)}
+      >
+        <ActionDelete />
+      </Button>
+      <Confirm
+        isOpen={open}
+        loading={loading}
+        onConfirm={handleConfirm}
+        onClose={handleDialogClose}
+        title="resources.devices.action.erase.title"
+        content="resources.devices.action.erase.content"
+        translateOptions={{
+          id: record.id,
+          name: record.display_name ? record.display_name : record.id,
+        }}
+      />
+    </Fragment>
+  );
+};
diff --git a/src/components/users.js b/src/components/users.js
index 405635a..fdeb52a 100644
--- a/src/components/users.js
+++ b/src/components/users.js
@@ -2,6 +2,7 @@ import React, { cloneElement, Fragment } from "react";
 import Avatar from "@material-ui/core/Avatar";
 import PersonPinIcon from "@material-ui/icons/PersonPin";
 import ContactMailIcon from "@material-ui/icons/ContactMail";
+import DevicesIcon from "@material-ui/icons/Devices";
 import SettingsInputComponentIcon from "@material-ui/icons/SettingsInputComponent";
 import {
   ArrayInput,
@@ -24,6 +25,7 @@ import {
   TextInput,
   SearchInput,
   ReferenceField,
+  ReferenceManyField,
   SelectInput,
   BulkDeleteButton,
   DeleteButton,
@@ -38,6 +40,7 @@ import {
 } from "react-admin";
 import SaveQrButton from "./SaveQrButton";
 import { ServerNoticeButton, ServerNoticeBulkButton } from "./ServerNotices";
+import { DeviceRemoveButton } from "./devices";
 import { makeStyles } from "@material-ui/core/styles";
 
 const useStyles = makeStyles({
@@ -288,6 +291,7 @@ const UserTitle = ({ record }) => {
 
 export const UserEdit = props => {
   const classes = useStyles();
+  const translate = useTranslate();
   return (
     <Edit {...props} title={<UserTitle />}>
       <TabbedForm toolbar={<UserEditToolbar />}>
@@ -337,6 +341,37 @@ export const UserEdit = props => {
             </SimpleFormIterator>
           </ArrayInput>
         </FormTab>
+        <FormTab
+          label={translate("resources.devices.name", { smart_count: 2 })}
+          icon={<DevicesIcon />}
+          path="devices"
+        >
+          <ReferenceManyField
+            reference="devices"
+            target="user_id"
+            addLabel={false}
+          >
+            <Datagrid style={{ width: "100%" }}>
+              <TextField source="device_id" sortable={false} />
+              <TextField source="display_name" sortable={false} />
+              <TextField source="last_seen_ip" sortable={false} />
+              <DateField
+                source="last_seen_ts"
+                showTime
+                options={{
+                  year: "numeric",
+                  month: "2-digit",
+                  day: "2-digit",
+                  hour: "2-digit",
+                  minute: "2-digit",
+                  second: "2-digit",
+                }}
+                sortable={false}
+              />
+              <DeviceRemoveButton />
+            </Datagrid>
+          </ReferenceManyField>
+        </FormTab>
         <FormTab
           label="resources.connections.name"
           icon={<SettingsInputComponentIcon />}
diff --git a/src/i18n/de.js b/src/i18n/de.js
index bee641b..56b2ab4 100644
--- a/src/i18n/de.js
+++ b/src/i18n/de.js
@@ -50,7 +50,7 @@ export default {
         id: "Benutzer-ID",
         name: "Name",
         is_guest: "Gast",
-        admin: "Admin",
+        admin: "Server Administrator",
         deactivated: "Deaktiviert",
         guests: "Zeige Gäste",
         show_deactivated: "Zeige deaktivierte Benutzer",
@@ -64,6 +64,11 @@ export default {
         address: "Adresse",
         creation_ts_ms: "Zeitpunkt der Erstellung",
         consent_version: "Zugestimmte Geschäftsbedingungen",
+        // Devices:
+        device_id: "Geräte-ID",
+        display_name: "Gerätename",
+        last_seen_ts: "Zeitstempel",
+        last_seen_ip: "IP-Adresse",
       },
       helper: {
         deactivate: "Deaktivierte Nutzer können nicht wieder aktiviert werden.",
@@ -122,6 +127,17 @@ export default {
         user_agent: "User Agent",
       },
     },
+    devices: {
+      name: "Gerät |||| Geräte",
+      action: {
+        erase: {
+          title: "Entferne %{id}",
+          content: 'Möchten Sie das Gerät "%{name}" wirklich entfernen?',
+          success: "Gerät erfolgreich entfernt.",
+          failure: "Beim Entfernen ist ein Fehler aufgetreten.",
+        },
+      },
+    },
     servernotices: {
       name: "Serverbenachrichtigungen",
       send: "Servernachricht versenden",
diff --git a/src/i18n/en.js b/src/i18n/en.js
index 84c82a8..8cb73e8 100644
--- a/src/i18n/en.js
+++ b/src/i18n/en.js
@@ -50,7 +50,7 @@ export default {
         id: "User-ID",
         name: "Name",
         is_guest: "Guest",
-        admin: "Admin",
+        admin: "Server Administrator",
         deactivated: "Deactivated",
         guests: "Show guests",
         show_deactivated: "Show deactivated users",
@@ -64,6 +64,11 @@ export default {
         address: "Address",
         creation_ts_ms: "Creation timestamp",
         consent_version: "Consent version",
+        // Devices:
+        device_id: "Device-ID",
+        display_name: "Device name",
+        last_seen_ts: "Timestamp",
+        last_seen_ip: "IP address",
       },
       helper: {
         deactivate: "Deactivated users cannot be reactivated",
@@ -122,6 +127,17 @@ export default {
         user_agent: "User agent",
       },
     },
+    devices: {
+      name: "Device |||| Devices",
+      action: {
+        erase: {
+          title: "Removing %{id}",
+          content: 'Are you sure you want to remove the device "%{name}"?',
+          success: "Device successfully removed.",
+          failure: "An error has occurred.",
+        },
+      },
+    },
     servernotices: {
       name: "Server Notices",
       send: "Send server notices",
diff --git a/src/synapse/dataProvider.js b/src/synapse/dataProvider.js
index 54c06d7..e4a3eb9 100644
--- a/src/synapse/dataProvider.js
+++ b/src/synapse/dataProvider.js
@@ -46,8 +46,8 @@ const resourceMap = {
       body: data,
       method: "PUT",
     }),
-    delete: id => ({
-      endpoint: `/_synapse/admin/v1/deactivate/${id}`,
+    delete: params => ({
+      endpoint: `/_synapse/admin/v1/deactivate/${params.id}`,
       body: { erase: true },
       method: "POST",
     }),
@@ -90,6 +90,19 @@ const resourceMap = {
       method: "POST",
     }),
   },
+  devices: {
+    map: d => ({
+      ...d,
+      id: d.device_id,
+    }),
+    data: "devices",
+    reference: id => ({
+      endpoint: `/_synapse/admin/v2/users/${id}/devices`,
+    }),
+    delete: params => ({
+      endpoint: `/_synapse/admin/v2/users/${params.user_id}/devices/${params.id}`,
+    }),
+  },
   connections: {
     path: "/_synapse/admin/v1/whois",
     map: c => ({
@@ -189,30 +202,18 @@ const dataProvider = {
   },
 
   getManyReference: (resource, params) => {
-    // FIXME
     console.log("getManyReference " + resource);
-    const { page, perPage } = params.pagination;
-    const { field, order } = params.sort;
-    const query = {
-      sort: JSON.stringify([field, order]),
-      range: JSON.stringify([(page - 1) * perPage, page * perPage - 1]),
-      filter: JSON.stringify({
-        ...params.filter,
-        [params.target]: params.id,
-      }),
-    };
 
     const homeserver = localStorage.getItem("base_url");
     if (!homeserver || !(resource in resourceMap)) return Promise.reject();
 
     const res = resourceMap[resource];
 
-    const endpoint_url = homeserver + res.path;
-    const url = `${endpoint_url}?${stringify(query)}`;
+    const ref = res["reference"](params.id);
+    const endpoint_url = homeserver + ref.endpoint;
 
-    return jsonClient(url).then(({ headers, json }) => ({
-      data: json,
-      total: parseInt(headers.get("content-range").split("/").pop(), 10),
+    return jsonClient(endpoint_url).then(({ headers, json }) => ({
+      data: json[res.data].map(res.map),
     }));
   },
 
@@ -299,11 +300,11 @@ const dataProvider = {
     const res = resourceMap[resource];
 
     if ("delete" in res) {
-      const del = res["delete"](params.id);
+      const del = res["delete"](params);
       const endpoint_url = homeserver + del.endpoint;
       return jsonClient(endpoint_url, {
-        method: del.method,
-        body: JSON.stringify(del.body),
+        method: "method" in del ? del.method : "DELETE",
+        body: "body" in del ? JSON.stringify(del.body) : null,
       }).then(({ json }) => ({
         data: json,
       }));
@@ -328,11 +329,11 @@ const dataProvider = {
     if ("delete" in res) {
       return Promise.all(
         params.ids.map(id => {
-          const del = res["delete"](id);
+          const del = res["delete"]({ ...params, id: id });
           const endpoint_url = homeserver + del.endpoint;
           return jsonClient(endpoint_url, {
-            method: del.method,
-            body: JSON.stringify(del.body),
+            method: "method" in del ? del.method : "DELETE",
+            body: "body" in del ? JSON.stringify(del.body) : null,
           });
         })
       ).then(responses => ({