CT14 Micro 4.2 Stereo Bluetooth Power Amplifier Board Module 5VF 5W+5W Mini with Charging Port for Refitting Idle Sound Box CT14 Micro 4.2 Stereo Bluetooth Power Amplifier Board Module 5VF 5W+5W Mini with Charging Port for Refitting Idle Sound Box. Sale price : $1.31 Category : Tools