Compatible system: Android4.4 or IOS8 or higherSuitable for mobile phones: 4.7-6.2inchLens: 52mm diameter aspheric superlensField of view: 110Vision adjustment: 200 degrees farsightedness to 400 degrees of myopiaWireless connection: BT 4.1, BLE dual protocolHeadphone unit: diameter 50mm, 112±3dB (1KHZ)Microphone: omnidirectional condenser mic, -42dBVibration unit: independent vibration on the left and right sidesBuilt-in battery: 3.7V lithium polymer battery, 350mA/HCharging power supply: DC 5.0V±0.3V/500mA,Micro USB interfaceProduct size: 140* 181*115mm (after folding)Product weight: 420g