SPECIFICATIONS: Mini Smart Home WIFI Amplifier With TUYA Hardware Parameters: Capacitance Full Screen Touch 4-inch IPS Display, 480*480 Resolution Android 11 System, 4 Core Processor, Cortex 1.2G CPU Power Supply Mode: AC 110-250VC Output Power: 2*20W with RJ45 port / 4*20W(without RJ45 port) Output Impedance: 4-8 Audio Inputs; Output Network: Support WIFI Installation: 86 standard wire box, front wall Bluetooth: Support ESHARE: Support Support TF card not exceed 32GB can be readOTGUSB disk not exceed 32GB USB2.0 can be read Frequency Response: 20Hz-20KHz Total Harmonic Distortion: 0.03%(1W,1KHz) Audio S/N: 96dB Product Size: 86*86*11MM Wire Box Opening Size: 86*86*57MM PACKAGE INCLUDED: 1 x wallamplifierdevice1 xremotecontrol1 x mountedbox1 x bracketandscrew PLEASE NOTES: Languages only supportEnglish and Chinese, please check before your purchase. Note : not all tuya devices can be controlled. Firstly, the controlled device must have tuya function. Only the following Tuya devices are controlled Switch, Turn off switch , On-off device, RGB light, light belt socket ,curtain,Air conditioning controller , Temperature controller For this device, can connect the maximum 2pcs or 4pcs 8ohm RMS 20W speakers and 8ohm (it's the best impedance). pls try to install compatiable app .if some app cannot open ,it's not our device quality problems,that's your app didn't compatible with our device