1. Adopts British CSR5.0 Bluetooth chip with separate connection functions and connects 2 Bluetooth devices at the same time.2. CVC wideband noise reduction it will not affect the call even in noisy environment let you enjoy pure sound.3. With hanging neck design unique telescopic earbud design foldable when not in use enjoy music as you like.4. One- smart boot voice function call vibration reminder EQ switch easy to use.5. 300 hours super long standby time it can work continuously for a long time. Specification: Material: ABS Color: Black Black White(optional)Comply Bluetooth Standard: V5.0Support: HSP HFP A2DP AVRCP Transmit Power: Class2Connection Range: ≤10m/32.81ftOperating Frequency Range: 2.4026GHz-2.480GHzCharging Time: ≤3.5 hours Talk Time: ≥18 hours Playing Time: ≥16 hours Standby Time: ≥300 hours Package List:1 x Earphone1 x Charging Cable1 x A Bag of Earbud Cover1 x Instructions