Features: Mini 4-inch high-definition touch screen System: Android 10.0 SPECIFICATIONS: Product name: Smart home Bluetooth wall amplifier Power supply Mode: AC 90V-250V/50H z-60Hz Output Power: A-2x25W / B-4x25W Output lmpedance: 4-8Ω Bluetooth: 10 meters Instalation: 86 standard wire box, front wall NOTES: In some country, the FM Radio Function may not works well, because the signal may be affected due to different frequencies in different countries and regions. Languages only support English and Chinese, please check before your purchase. For this device, speaker cable and power cable is not included. ① Don't connect exceed RMS 25W /RMS 20W (P speaker and it should be 8ohm. If your speaker exceed 8ohm RMS 25Watts/20Watts, the amplifier will be burnt out as your own risk. ② Use exceed 150-core pure copper speaker cable to connect speakers. ③ Use power cable cord as the amplifier request (two cord). amplifier type: A-black amp / B-white amp Material: plastic colour: Black/white Package Contents: 1 x smart touch screen on-wall amplifier 1 x mounted box 1 x remote control 1 x bracket and screw Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.