Product Information : • Wireless Bluetooth Connectivity :Enjoy the freedom of wireless connectivity with this headset that connects to your device via Bluetooth. • Invisible Design :The invisible design of this headset makes it perfect for use in public without drawing attention to yourself. • Active Noise-Cancellation :Block out unwanted noise and distractions with the active noise-cancellation feature of this headset. • Volume Control :Adjust the volume of your music or calls with ease using the built-in volume control feature. Features: Small and lightinvisible mini body. Three-frequency equalization Powerful Bass,sothe sound quality is very satisfactory. As long as the phone has bluetooth, it can beconnected. Comfortable and painlessfor a long time use. Specification: Bluetooth version:Version 4.2 Effective distance:10-18M Battery capacity:polymer lithium battery 50mAh Listening to music:2.5 hours last and next song / pause Calling time:3 hours Charging time:1-2 hours Notes: Please use a reputable charger for charging