Product summary DY-HV20T is an intelligent voice playback module independently developed by our 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 Class D audio amplifier; Supports MP3.WAV Decoding; Support Micro-SD card maximum 32G bytes, downloading music files directly By Micro-USB connector. Music control mode as follows Note: Music files should be named with five numbers, such as 00001.mp3 ~ 00008.mp3 colour: black Material: plastic size: 50x50mm Package Contents: 2 x Voice playback module 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. 4. Plays 65535 pieces of music by UART control protocol; Play, pause, select music, VOL +/- and so on can be controlled, the communication baud rate is 9600bps. Plays 255 pieces of music from IO trigger. 2. 24bit output, support dynamic range 90dB, 85dB. Wide DC supply voltage: 6 ~ 35V. Supports Micro-SD card maximum 32G bytes. 3. Maximum output 20W driving 4 ohm speaker, maximum output 10W driving 8 ohm Speaker 5. with One_line control protocol, play, pause, select music, VOL +/- and so on, It can be controlled. Change 7 working modes with DIP switch easily. ESD protection designed for 8 IOs. 1. Supports MP3.WAV decoding. Sampling frequency (K Hz): 8 / 11.025 / 12/16 / 22.05 / 24/32 / 44.1 / 48.