Features: Bluetooth 5.0 scheme, stable model Support waterproof; The headset compartment has a built-in lithium battery, which supports. charging the headset; Touch key, a fashionable collar, easy to use Independent noise reduction, wireless stereo, good sound quality; Multiple devices are compatible and widely used; Intelligent pairing, automatic pairing after power on, putting earphones into the charging box, and intelligent disconnection for charging; A large capacity 300mAh battery is built in the charging bin to charge the headset more times; Ergonomic design, comfortable to wear. Note: Please allow 1-3mm differences due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding.  Specification: Chipset: JL6936D Support protocol: HSP, HFP, HPP, A2DP, AVRCP, CVC Bluetooth version: V5.0 + EDR Wireless carrier frequency: 2402MHz-2480MHz Audio frequency response range: 20Hz-20KHz Transmission range: ≥ 10m Power supply voltage: 3.3~4.2V Charging voltage: 5V Charging current: 50mA Standby current: 0.5mA Bluetooth call working current: 18mA Connect Bluetooth to listen to music working current: 20mA Standby time: 240h Talk time: ≥ 5h Listening time of Bluetooth headset: ≥ 4-5h Charging time: 1H Battery capacity of headset: 40mAh (polymer lithium battery) The battery capacity of charging chamber: 300mAh (polymer lithium battery) Horn: 8mm, 16 Ω copper ring Package size: 120 * 80 * 32mm/4.72*3.14*1.25'' Package Included:  2 X Bluetooth Headsets 1 X Charge Box. 1 X User Manual