SN-537K 5.3 Bluetooth Live Earphones Built-In Sound Card Wireless Receiver Sports Earphones 1. Bluetooth version: 5.0 + EDR 2. Transmission distance: about 10m 3. Battery capacity: 800mAh 4. Charging input: 5V 1A 5. Charging port: Type-CUSB-C 6. Playback time: about 10-12h 7. Wireless frequency: 2.4GHZ 8. Remote control battery: AA dry battery (not included) x 2 9. Weight: about 52g Features: 1. Wireless sound card, the whole wireless operation, with wireless remote control 2. Built-in sound card, 20 kinds of electric tone base 3. retain the original function, Bluetooth listening calling 4. Half in-ear type, heavy bass effect 5. Self-monitoring, real-time ear monitoring without delay, at any time to connect the PK, two-way communication 6. Compatible with computers and cell phones, wide applicability 7. Multiple wireless accompaniment, Bluetooth transmission, intelligent voice change 8. Automatic frequency pairing, power on automatically connected 9. Lightweight and portable, with power display 10. 3 connection modes: - 2.4G receiver live connection, wireless operation - OTG lossless audio live connection, connected for live streaming, shooting pickup, recording, etc., can be used to watch movies, lossless audio effect - 4 audio cable live connection, lossless audio live, clear sound, can be used for singing and recording songs to upload special effects sound Packing list: - Bluetooth headset x 1 - Data cable x 1 - Audio cable x 1 - Instruction manual x 1 - 2.4G transmitting receiver x 1 - 360 degree wireless ballad controller x 1 - Storage bag x 1