Speaker parameters: 0.5-5 2-8 ohms (volume adjustable) Maximum memory supported: 32G Supported playback formats: MP3, WAV File format requirements: You need to create a folder named "01" and then save the files 001.MP3 -019.MP3 Working temperature and humidity: -20-50℃, : 5%-90% Name: Voice playback module Model: -M3D5T Specifications: 7.2x3.5x0.9cm Power supply voltage: 5V (range 3.7-5.5V, support 3.7V/4.2V such as 18650, output capacity 200mah) Power supply current: equal 300ma ( 50ma is also acceptable when the speaker is not connected) Standby current: 36MA Working current: 50MA (specifically related to the speaker and sound size) Trigger ports: 19 (one port corresponds to one MP3) Function ports: 5 (up and down music, volume increase and decrease, pause/play) Possible modes: single without looping, single looping, playback without interruption, long play mode Note:When using battery power supply, make sure the capacitor capacity is large enough, otherwise it not work properly after the voltage drops to 3.5V when there is a lack of power. Colour:As Shown Material:plastic 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.