Features: brand new and high quality Built-in rechargeable lithium ion battery, long standby for time and long working for time. Support for iphone battery display, convenient to know when to charge. The new waterproof structure design supports the Siri intelligent voice control function of IOS 4.0 and above, and supports the android intelligent voice control function, which is convenient, fast and intelligent. Using the latest BT 5.0+EDR technology, superior signal transmission, ultra-low power consumption, full hequipment, automatic answering function, switchable manual answering function, safe and fast, built-in high-quality anti-interference microphone, which can effectively realize hands-free answering and Hang up. High-fidelity sound effects, support for the previous or next song functions, volume increase and decrease, playback pause, automatic callback and other functions, easy to operate. Automatic Answering Incoming Calls:The incoming call will be answered automatically after the number is reported, no need to reach out for operation, safe riding. After online, double-click the + button to switch to answering the phone manually, which is convenient and free. Specifications: BT version: 5.0 Frequency range: 2.402GHz~2.480GHz BT distance: 10~30m (varies by phone and environment) Microphone distance: ≤1m Lithium battery capacity: 3.7V/2000mAh Charging voltage: 5V Quiescent current: 0μA Charging time: 5~7 hours Standby time: about 450 hours Working time: about 120 hours Low battery warning voltage: 3.3V Low battery shutdown voltage: 3.15V Low battery reminder time: 4 minutes Material: ABS Color: Black Net Weight: 280g/0.62lbs Package Includes: 1x Handsfree Wireless Motorcycle Helmet Headset note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.