High Quality Dimensions: 12.45 x 8.64 x 4.06 cm Weight: 120 g Battery: 1 Lithium Polymer battery required (included) Missing Instructions Manual but Easy to Operate! Convenient & Comfortable - Designed to fit in either ear & suited to be worn for hours Lightweight - Effortless Transport Crystal Clear Sound Comes with 3 different sizes of ultimate comfort ear gels Weather-resistant carrying case protects the headset from damaging & getting lost. Bluetooth 4.1 Technology - Provides fast & stable pairing with smart phones, tablets, laptops,PC, MP3 players from up to 33' away. It can pair easily with any two Bluetooth devices at once. With up to 8-10 hrs of continuous calls & up to 7.5 days in standby mode, this earpiece lets you make reliable wireless calls throughout the day on a single 1.5 hrs quick charge! Hands-free for Calling - Supports Siri & Google voice assistant. Easily mute/unmute with the touch of a button. Voice alerts battery level, connection status, mute/unmute status, & even announce the phone number of income caller. Long Battery Life - Bluetooth headset built-in 95mAh high-performance battery, up to 10 hrs talk time!