New Mini Wireless Sport Bluetooth Earbuds STEREO In-Ear Earphone Description: 4.0 smart chip, Efficient transmission speed. Compact, ultralight design stereo Bluetooth Headset, Portable and Easy To Carry. High-fidelity sound quality, Wireless songs enjoy Voice report number, low power remind, Connect/disconnect remind, Boot off prompts. Allows you to conveniently answer calls while driving. Supports Two Mobile Phones Simultaneously Connected. Long battery life, fast charging. Support WeChat, QQ voice calls, movie, Compatible for Almost All The Mobile Phones And Tablet PC Specification: Drive: 40 mm Impedance: 32 OHM Bluetooth version: Bluetooth v4.1 + EDR Power Level: CLASS II Output Power: 30mW Bluetooth distance: 10 meters barrier Frequency response: 20-20000 Hz Operating voltage range: 3.0V-4.2V Microphone sensitivity: -42dB with A2DP / AVRCP high-quality stereo audio transmission and remote control protocol Powerful noise cancellation circuit (Active Noise Reduction) Wired and Bluetooth automatically switch to support audio input Charging time is about 1 hour (power indicator Charging: blue light lights, fully charged: blue light goes out) Dimensions: Diameter length 20MM.Width 15MM.18mm high Talk time About 4 hours Music for about 3 hours The standby time is about 3-4 days Charging Power: DC5V Power Interface [the hole] (computer USB port, mobile phone charger, car charger) Compatible: Compatible with Android, Apple, Microsoft, Symbian 99% of with Bluetooth cell phones(IOS cell phone has power display) Color: Black, White, Beige, Pink