ADVANTAGE: Digital amplifier has a higher overload capacity than analog amplifier, and it won't cause crossover distortion, transient inter modulation distortion and you don't have to worry about the loudspeaker internal resistance. SUPPORTS MANY O INPUT WAYS: It supports many o input ways including Bluetooth, USB, TF card and o input jack. INSTRUCTIONS: Dual channel of 50W+50W power output, 100W subwoofer output and a wide input voltage range from 12V to 26V DC. SOUND QUALITY IS VERY GOOD : Sound quality is very good by using this o power amplifier module. APPLICABLE SPEAKER IMPEDANCE: Applicable speaker impedance are 4/6/8 ohm, great for turning normal speaker into Bluetooth speaker. Chip:TPA3116 o input:Bluetooth, USB, TF, o input jack o format:MP3, WMA, WAV, FLAC Appropriate impedance:haut-parleur 4, 6, 8 ohms Appropriate impedance:speaker 4, 6, 8 ohms Input voltage:12 ~ 26V DC Colour: picture color Material: ABS Size: 12.4x8cm Package Contents: 1 * Power Amplifier Board Only the above package content, other products are not included. Note: Light shooting 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.