Feature:1. Automatic Connection: The motorcycle helmet Bluetooth headset has an effective distance of 1015 meters (depending on the environment around the device such as obstacles), automatic connection, and strong signal.2. Long Play: Long standby and working time. Playing time: 45 hours. Support 48 hours standby time. Charging time 2 hours.3. Stereo Sound: These helmet headphones are noise canceling and deliver clear, premium stereo music sound.4. Hands Free Calling: Hands free calling function, automatic answering or manual answering after broadcasting the caller's phone number.5. Applicable Scene: Compatible with all Bluetooth enabled smart devices, suitable for motorcycles, rock climbing, skiing, cycling, takeout, etc.Specification:Item Type: Motorcycle Helmet Bluetooth HeadsetMaterial: ABSBluetooth: 5.0Frequency: 2.402GHz-2.480GHzRange: 10-15 Meters (Depending on the Environment Around the Device Such As Obstacles)Transmission Distance of Microphone: 1meterLithium-ion Battery: 3.7V/180mAh Lithium Ion Battery (Delivery with Battery)Playing Time: 4-5 HoursCharging Voltage: 5VCharging Time: 2 HoursStandby Time: 48 HoursConnection Name: BT8.Package List:1 x Motorcycle Helmet Bluetooth Headset1 x Micro USB Charging Cable2 x Touch Fastener