Hardware Parameters: 1.77inch Display Key Touch Power Supply Mode: AC 110-250VC Output Power: 2*25W/4*25W Audio Inputs one set; Output one set Audio Signal-to-Noise Ratio: 98d B Radio Function: Built-in digital automatic FM radio, 30 stations FM Range: 87.5-108MHz Blue-tooth Version: 5.0 Blue-tooth Distance: 10m Installation: 86 standard wire box, front wal l Product size: 86*86*10mmFunction Description:1.Audio Format: Support MP3, WAV, WMA, etc. 2.Support LRC lyrics display 3.Support TF card, USB Play 4.Support external voice source input, amplify output 5.Support departure doorbell 6.Multi-stage timing switch, music play,linkage triggered play formula music 7.Supporting power-off memory, power-on and memory the state of play before shutdown 8.Volume control: 30 Level Electroni