1pair YH-VD48508 SC 8-way Bidirectional Data Network Optical Transceiver Fiber Optic Transceiver(Black) Tag-Alarm System 4 In 1 Multifunctional Bluetooth

4 In 1 Multifunctional Bluetooth Headphones: Bluetoothe headphones + TF card music player + Wired headset+Fm radio

forefinger there are special conduction material

Size 400x55x60mm

Power: 5W*1

Two-color transparent keycaps

1pair YH-VD48508 SC 8-way Bidirectional Data Network Optical Transceiver Fiber Optic Transceiver(Black) Tag-Alarm System 4 In 1 Multifunctional Bluetooth1. 8 way bidirectional data network optical transceiver 2. Good compatibility, quality chip, stable performance, SC 3. Plug and play, stable transmission, fully compatible 4. Easy to use, two way communication, good heat dissipation, stable performance, easy to use 5. Long distance transmission, optical fiber transmission distance up to 20KM (single mode) 6. No software, no drivers, wide range of uses, plug and play 7. The design of multiple cooling