Brand Name:QiiluFeaturesBone conduction technology - liberating the ear: Through vibration work, the sound is transmitted to the cochlea through the tibia, which can avoid hearing damage compared with ordinary headphones.The open ear design helps you stay alert and avoid danger.Sports design: IP55 waterproof, can resist the sweat of light rain and outdoor sports (such as jogging, cycling, running, driving, etc.), also suitable for yoga.Use ABS + to make the headset lighter, but more durable. Ergonomically designed and comfortable to wear, make sure you are free to exercise and don't worry about falling.SpecificationPackage Size: about 14.7*11.9*6.1cm/5.79*4.69*2.4inchBlue tooth IC: CSR8635Speaker Type: Bone conduction technology speaker, 1w dual speakerBattery: 200mAh Power batteryMic: Anti-interference microphones, -42DBPlay time: 5hStandby time: 7daysEffective range: 10m (33feets)Mono/Stereo: StereoBlue tooth Version: V5.0Bluetooth Class (1/II): Class IIBQB included(Y/N): NoBluetooth Profile: a2dp/HFP, HSP, AVRCP, GAVDP, AVDTPReceiving Sensitivity: 88dBmImpedance: 8ΩFrequency range: 20-20KHzFM: NoCharging: MICUSB port and need 2hourTF card: NoSystem language: English - Prompt tone is EnglishPackage List1 x Headphone1 x USB Cable2 x Earbuds1 x Instruction Manual