Compatibility: Supports all Bluetooth mobile phone, tablet, notebook, singing it, QQ music, movies, etc. Driver: 15mm Impedance: 32 OHM Bluetooth version: Bluetooth v4.2 + EDR Bluetooth use band: 2.4GHz Power level: CLASS II Output power: 30mW Bluetooth distance: 10 meters barrier Frequency response: 20-20000Hz Operating voltage range: 3.0V-4.2V Mic sensitivity: -42dB Listening to the song correct, support songs and call, Remind call number, the last call back, all intelligent Chinese and English voice prompts, boot, pair, shut down the phone power will be low voice prompts Power capacity will show on your Iphone, you can see the power situation anytime, do not worry about the electricity ,make your life without worry One to two connections, can be connected to two mobile phones at the same time Bluetooth headset connected to the phone after the shutdown , and then open the Bluetooth headset will connect back to the phone automatically , more convenient; Intelligent compatibility: support all Bluetooth mobile phone, tablet, notebook, singing it, QQ music, movies, etc. Powerful noise de-noising circuit (active noise reduction) Switch between Chinese and English (boot does not connect Bluetooth state, press the switch 2 times, hear the tone switch successfully) Talk time is about 4-5 hours music time about 4-5 hours Standby time is about 100 hours With A2DP / AVRCP high quality stereo audio transmission and remote control protocol Brand I7S SKU 100348692_NP-1020616895 Compatible Devices Not Specified