A. Supports MP3 and WAV decoding. Sampling frequencies (K Hz): 8 / 11.025 / 12 / 16 / 22.05 / 24 / 32 / 44.1 / 48. B. 24 - bit DAC output, supporting dynamic ranges of 90dB and 85dB. It has a wide DC supply voltage range of 6 - 35V. Supports -SD cards up to 32G bytes. C. Maximum output of 20W when driving a 4 - ohm speaker, and 10W when driving an 8 - ohm speaker. D. Can play 65535 pieces of music via the UART control protocol. Operations such as play, pause, music selection, volume adjustment (+/-) can be controlled, with a communication rate of 9600bps. Can play 255 pieces of music from an IO trigger. E. Can play music using the One - line control protocol. Play, pause, music selection, volume adjustment (+/-) and other operations can be controlled. Allows for easy change of 7 working modes with a DIP switch. ESD protection is designed for 8 IOs. F. Product summary: - DY - HV20T is an intelligent voice playback module independently developed by an enterprise. It integrates IO Trigger, UART Protocol Control, Single Bus One - line Protocol Control, and has 7 other operating modes set by a DIP switch. It can drive 4 - 8 ohm, 10W - 20W speakers with an onboard 20W D audio amplifier. Supports MP3 and WAV decoding. Supports -SD cards up to 32G bytes, and music files can be downloaded directly via a -USB connector. G. Music control mode note: Music files should be numbered, such as 00001.mp3 - 00008.mp3. H. Colour: black I. Material: plastic J. Size: 50x50mm K. Package Contents: - 1 x Voice playback module. Only the above package content is included, and other items are not. L. Note: Lighting and different displays may cause the color of the item to appear slightly different from the real thing. The measurement error is allowed to be +/- 1 - 3cm.