AMPLIFIER

5 In 1 USB Bluetooth 5.2 Transmitter Receiver Stereo Bluetooth RCA USB 3.5mm AUX For TV PC Headphones Home Stereo Car HIFI Audio     

4 channel speed sensor module motor speed counting module groove coupler module

PAM8610 Digital Power Amplifier Board 2x15W Dual Channel Stereo D Class High-power Amplifier Board Miniature

PAM8403 2.5-5v Super mini digital power amplifier board