1. Supports MP3.WAV decoding. Sampling frequency (K Hz): 8 / 11.025 / 12/16 / 22.05 / 24/32 / 44.1 / 48. 2. 24bit DAC output, support dynamic range 90dB, 85dB. Wide DC supply voltage: 6 ~ 35V. Supports -SD card maximum 32G bytes. 3. Maximum output 20W driving 4 ohm speaker, maximum output 10W driving 8 ohm Speaker 4. Plays 65535 pieces of music by UART control protocol; Play, pause, select music, +/- and so on can be controlled, the communication rate is 9600bps. Plays 255 pieces of music from IO trigger. 5. Play music with One_line control protocol, play, pause, select music, +/- and so on, It can be controlled. Change 7 working modes with DIP switch easily. ESD protection designed for 8 IOs. Product summary DY-HV20T is an intelligent voice playback module independently developed by Enterprise, Integrated IO Trigger, UART Protocol Control, Single Bus One_line Protocol Control, standard MP3 and 7 other operating modes DIP switch setting; Drive 4 ~ 8 ohm, 10W ~ 20W speaker by onboard 20W D audio amplifier; Supports MP3.WAV Decoding; Support -SD card maximum 32G bytes, downloading music files directly By -USB connector. Music control mode as follows Note: Music files should be with numbers, such as 00001.mp3 ~ 00008.mp3 colour: black Material: plastic size: 50x50mm Package Contents: 1 x Voice playback module Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.