100% SATISFACTION GUARANTEE! Bluetooth Headset Wireless Earpiece Headphones V4.1 & Mic for iPhone Samsung LG Description Crystal Clear Audio - With the built-in advanced boom microphone and Dynamic Speaker, Bluetooth headset broadcasts your speech clearly while you move around and perform your tasks you’re on-the-go or working in the office. Friendly Design - Equipped with Extendable Earhook (extendable), fits a wide range of ear shapes. 270 degrees rotatable flip-boom arm allows to fit this bluetooth earpiece in right or left ear. Unique plastic carrying case protects the headset from damaging and losing. Universal Compatible - Bluetooth V4.1 headset supports Calling and Music Playing function, easy and fast pairing with smart phones and tablets(Bluetooth v4.2 or lower), compatible with iPhone(X), Android, and Other Leading Smartphones Specifications Bluetooth Version 4.1 + EDR Support Bluetooth file: HSP / HFP / AAC / A2DP / AVRCP Range: 33 feet (10 meters) Talk time: about 9 hours Standby time: about 180 hours Charge time: about 2 hours Operating temperature: 14°F to 122°F (-10°C to 50°C) Quick Start Guide On - Hold the MFB for 3 seconds (Blue indicator flashes) Off - Hold the MFB (Red indicator flashes twice) Enable Pairing Mode - Hold the MFB key for 6 seconds Answer call - Click the MFB once End a call - Click the MFB once Reject the incoming Call - Hold the MFB for 2 seconds Latest Number Redialing - Double click the MFB twice Volume up - Click the volume + button Volume down - Click the volume - button Previous track - Hold the volume - button Next track - Hold the volume + button Music play / pause - Click the mute button