Quantity   Component name
1 × Technics RP-DH1200 Headphones I have used them since 2005!
1 × F-3188 Bluetooth module with CSR8645 chip
1 × TP4056 Lithium battery charging module with Micro-USB
1 × 3.7 V 220 mAh 501240 Lithium battery
1 × Self-lock switch button ON/OFF
2 × SMD buttons Play/pause and next track