CSR bluetooth version: 8635 V4.1, frequency range: 2.402 GHZ ~ 2.480 GHZ ISM Band, wireless emission standards: CLASS 2, the signal distance: about 10 meters, the frequency response: 20 hz - 20 KHZ, signal-to-noise ratio: 85 db, status indication: LED indicator, the voice prompt, song/volume up and down, YES/NO function, charging power supply, computer USB port, the output of DC 5 v charger, charging time: 1-2 hours, continuous play/talk time: about 5 to 6 hours, standby time (standby) : about 160 hours
* bluetooth version: V4.2 + EDR
Chip: Airoha AB1511J