Product parameters: Model: morul U2 Bluetooth version: 4.1 Waterproof : IPX7 Impedance: 16 Sensitivity: 109db Frequency : 20Hz-20KHz Noise: CVC6.0 Continuous working time: 10 hours Charging time: 1-2 hours Wire Operation: Support Speaker size: 11mm Voice features: support call，English voice prompts Other functions: switch songs， bottom redial IPX7 waterproof ''Shallow ear design ''120 ma capacity battery ''Multipoint connection Magnetic Design ''Built-in high sensitivity microphone .Package Included: 1x U2 Headset 1x USB Cable 1x User Manual