Speaker parameters: 0.5-5 watts 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℃, HR: 5%-90% Name: Voice playback module Model: YS-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 Greater than 200mah) Power supply current: greater than equal 300ma (Greater than 50ma is also acceptable when the speaker is not connected) Standby current: 36MA Working current: Greater than 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 press play mode Note:When using battery power supply, make sure the capacitor capacity is large enough, otherwise it will 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