I am an international seller,providing customers with high-quality and inexpensive products. Our shop sells the most popular 3C consumer electronics products,such as mobile phone accessories,computer accessories,game peripherals,smart wearables,and follow the most popular fashion trends. If you like our products,please follow us,become our follower and fan.We will provide you with the most popular products to satisfy your fashion shopping experience.Specification:4.0 smart chip, efficient transmission speed.Compact, ultra light 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, Bluetooth V4.0, superior compatibility.Compatible for almost all the mobile phones and tablet pc, etc. Instruction:1. Please fully charge the headset before using.2. Restart your phone.3. Turn on the headset, please long press and hold MFB button for 5 or 6 seconds until the light starts flashing an alternating red-blue.(This is the key step.)4.Then turn on Bluetooth on your phone,search and connected it with the ear piece.　Item Name: Bluetooth EarphoneDrive: 40mmImpedance: 32OHMBluetooth version: Bluetooth V4.0 + EDRPower Level: CLASS IIOutput Power: 30mWBluetooth Distance: 10 Meters BarrierFrequency Response: 20-20000 HzOperating Voltage Range: 3.0V-4.2VMicrophone Sensitivity: -42dBWith A2DP / AVRCP high-quality stereo audio transmission and remote control protocol.Powerful noise noise cancellation circuit (active noise reduction).Wired and Bluetooth automatically switch to support audio input.Charging time is about 1 hour (power indicator charging).Talk Time: about 2-3 HoursMusic Time: about 2-3 HoursStandby Time: about 3-4 DaysCharging Power: DC5V Power InterfaceCompatible: for Android, for Apple, for , for Symbian 99% of with Bluetooth cell phones(for iOS cell phone has power display)Size: 30mm x 15mm x 18mm/1.18" x 0.59" x 0.71" (Approx.) Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement. Package Includes:1 x Bluetooth Earphone (Not 1 Pair)1 x USB Cable