With Bluetooth receiver amplifier card, AMP board is entitled with high performance according to strict rule. Support , amplifier module keeps long service life so you can for a long time. Meanwhile, such audio amplifier board supports USB charging function, which is easy to in the practical life. Via craft by many experts, this audio part is made of materials in high quality. AMP board's installation is simple, which does not require particularly complicated operations. Item Type: : Digital amplifier board Chip : Pam8403 Transmission Distance: Up to 20 m(unblocked) Channel: 2 Maximum : 5w + 5w size:10 x 7 x 2cm Material:PCB colour:green Package Contents: 1 x Digital Bluetooth amplifier board Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.