Other than the IKEA TRÅDFRI Signal Repeater (which works out-of-the-box though suggest updating OTA firmware on it anyway) I recommend flashing ITead’s Sonoff branded “ZBDongle-E” and/or “ZBDongle-P” with respective Zigbee Router firmware and then using them in a standard USB-charger for power:
Comparing “ZBDongle-P” vs. “ZBDongle-E” vs. barebone EFR32MG21 dongle
verses 
versus 
| Feature/Model | ZBDongle-P | ZBDongle-E | 9888010100045 |
|---|---|---|---|
| Radio SoC/MCU chip | Texas Instruments CC2652P | Silicon Labs EFR32MG21 | Silicon Labs EFR32MG21 |
| Zigbee Stack (Serial Interface Protocol API/CLI) | Z-Stack v3 (ZNP 3) | EmberZNet (EZSP v8) | EmberZNet (EZSP v8) |
| Optional Zigbee Router firmware | Yes (9dBm firmware available from Koenkk) | Yes (20dBm firmware available from ITead) | Yes (20dBm firmware available from ITead) |
| USB to UART/Serial Converter Chip | CP2102 or CP2102N | CH9102F | CH340 |
| USB EEPROM Product Description ID | SONOFF Zigbee 3.0 USB Dongle Plus | SONOFF Zigbee 3.0 USB Dongle Plus V2 | None (no USB chip EEPROM) |
| Home Assistant USB Auto Disovery | Yes | Not yet | Not possible |
| Flow Control | None by default (Hardware flow control optional with alternative firmware and flipped dip-switch） | Software flow control | Software flow control |
| RF Transmit Output Power | 9dBm (firmware hardcoded), Max: 20dBm | 20dBm (default) | 20dBm (default) |
| Antenna | External (rotatable and tiltable) | External (rotatable and tiltable) | Onboard circuit board antenna |
| Enclosure/case | Aluminum all-metal shell casing | Aluminum all-metal shell casing | None |
| Length | 63mm | 52mm | ? |
| Packaging | Retail-box with manual | Retail-box with manual | Anti-static bag only |
| Home Assistant ZHA | Supported | Supported | Supported |
| Zigbee2MQTT | Supported | Experimental support as still in development by zigbee-herdsman dev, see https://github.com/Koenkk/zigbee-herdsman/issues/319 | Experimental support as still in development by zigbee-herdsman dev, see https://github.com/Koenkk/zigbee-herdsman/issues/319 |
| IoBroker | Supported | Experimental support as still in development by zigbee-herdsman dev, see https://github.com/Koenkk/zigbee-herdsman/issues/319 | Experimental support as still in development by zigbee-herdsman dev, see https://github.com/Koenkk/zigbee-herdsman/issues/319 |
| OpenHAB ZigBee Binding | Not yet, see request and discussion | Supported | Supported |
| Domoticz Zigbee Plugin | Supported | Supported | Supported |
| Jeedom Zigbee Plugin | Supported | Supported | Supported |