Description: Advanced Technology: This helmet headset features 5.0 technology, supporting protocols such as A2DP, HFP, HSP, VRCP, and SPP. It has a working range of up to 10 meters (up to 30 meters in an obstaclefree environment), ensuring a stable and seamless connection. Versatile Use and DIY Compatibility: Not only limit to helmet headphones use, this device can also be used as a receivers at home or for DIY purposes with any regular earphones with a standard 3.5mm jack. Handsfree and Two Connection: The headset supports automatic answering of incoming calls for safe riding and can be paired with two mobile phones simultaneously for easy switching between devices. User Friendly Design: With independence function keys for volume control and song switching, this headset ensures accurate operation while riding safely. It also supports voice assistant activation by pressing the "multi function key", making navigation and music listening more convenient. Stylish Appearance and Material: Made from ABS material with dimensions of 8.3cmx4.3cmx2.4cm, this headset sports a minimalist luxury appearance complemented by blue effects that show youthful energy. Specification: 8.3cmx4.3cmx2.4cm/3.27inchx1.69inchx0.94inch Color: Blue Material: ABS version: 5.0 Supported protocols: A2DP, HFP, HSP, VRCP, SPP Microphone distance: Frequency range: 2.402-2.480GHZBattery capacity: 3.7V/1000MAH Charging time: about 4 hours Working time: about 18 hours Standby time: 360 hours Charging input: DC 5V> 380ma Working temperature: -10-50C Package Includes: 1 Earphones 1 3.5mm Microphone Kit 1 Charging Cable 1 Earphone Spring Back Clip 1 Manual