M8 NFC 2 in 1 NFC Optical Coaxial Bluetooth 5.0 Audio Transmitter Receiver with Digital Display Features: 1. Easy to install, plug and play 2. Using Bluetooth 5.0 chip design, stronger compatibility and stability 3. Bluetooth receiver (RX), Bluetooth transmitter (TX) two-in-one design, toggle switch to switch quickly 4. Equipped with high-definition LED digital display screen, working status and Bluetooth mode are clearly visible 5. Built-in digital to analog chip, supporting six signal interfaces of digital optical fiber, coaxial, AUX, RCA, U disk, TF card 6. NFC function, mobile phone can be connected with one touch 7. Cool breathing light, redblue color, soft and not dazzling 8. Built-in 500mAh rechargeable lithium battery, long battery life 9. Support 5-8 meters infrared remote control, all kinds of functions are readily available 10. Built-in high-definition microphone, support wireless music listening, hands-free calling, navigation 11. Compatible with Android, IOS system mobile phones and tablets, active speakers, power amplifiers, and Bluetooth speakers or earphones that support A2DPprotocol to connect and use Product specifications: 1. Support protocol: RX: A2DP, AVRC; TX: A2DP 2. Working frequency band: 2.402-2.480GHz 3. Response frequency: 20Hz-20KHz-0.2db 4. Signal to noise ratio: greater than or equal to 90dB 5. Input interface: 3.5mm AUX+RCA+optical fiber+coaxial+USB+TF interface 6. Output interface: 3.5mm AUX+RCA 7. Optical fiber parameters: support optical fiber input, 16M, sampling rate 96kHz 8. Support format: MP3WAVWMAAPEFLACG729M4AALACAMRDTSMIDIG726MTY 9. Screen size: 32x14.5x7mm 10. Working current: less than 40mA 11. Charging time: about 1.5 hours 12. Life time: RX is about 10H, TX is about 8H 13. Bluetooth distance: less than or equal to 10-15m (open place) 14. Charging method: Type-C 5V-0.5A 15. Product size: 86x65x22mm 16. Product weight: 75g