Multipoint techonology・ pairing with TWO Bluetooth devices simultaneously.Sleek・ ultra-lightweight design ensures that the devise remains secure and comfortable・ even when worn for long durations.Get rid of the wires when exercising! This Earphone is Bluetooth V4.0 + EDR・ fully backward compatible with Most Bluetooth Version Device (V4.0・ V3.0 + EDR・ V2.1 + EDR・V2.0 + EDR・ V1.2・ V1.0 etc.). Just make sure your phone (or other Device) is Bluetooth Device <br />- Bluetooth compliance: Bluetooth V4.0 <br />- Transmission Power: Class 2 <br />- Operating range: Up to 33 feet (10 meters) <br />- Talk time: Up to 3 hours (subject to phone) <br />- Stand-by time: Up to 70 hours (subject to phone).<br />- Weight: 6.2g