B7 Bluetooth binaural wireless headset $ 24.81 B7 true wireless semi-in-ear bluetooth headset Speaker size: 13.2mm Headphone size: 40X18X16mm Charging compartment size: 61X46X25mm Bluetooth version: 5.0+EDR Bluetooth support: phone hands-free Frequency response range: 20HZ-20Khz Bluetooth support protocol: AVRCP/A2DP/HSP/SPP Transmission frequency: 2. 4GHZ-248GHZ Bluetooth receiving effective distance: 10m Battery capacity: 30mAh With microphone: omnidirectional Bluetooth working time: continuous playback 4-5h Bluetooth standby time: 100H Input voltage/current: equipped with dedicated charging compartment Charging the headset in the charging compartment: 4-5 times Charging warehouse standby time: 60 days
