◆Bluetooth solutions：JL 6916   ◆Bluetooth version: 5.0+EDR◆Supported Profile :HSP1.2、HFP1.6、A2DP1.3、AVRCP1.5◆Battery: 45mAh*2 rechargeable  Lithium battery◆Working range: 10-15M   ◆Optimum call distance: 6M◆Talk Time :  3hours(80% on volume)                       ◆Music time: 4hours (90% on volume)◆Earphone charging time : about 1.5 hours◆Speaker size: 8mm  ◆Earphone size : 23.5*17mm◆Earphone maximum power: 0.3W◆Frequency : 20-20K HZ      ◆Impedance : 32 ohm                                                                                                     ◆Sensitivity : ≥-90dBm  ◆Weight: 5.3g                                                                                                                                                          Charging box  Specification :                                                                                                                          ◆Charging box battery: 400mAH   3.7V                                                                                                                                                                    ◆Weight：51.8g      ◆Charging box size: 80*40*27mm   ◆Charging base: about 2.5hours                                                             ◆Color option: Black , White                                                                                                       ◆Package size: 11*7*32CM