Bluetooth-compatible 5.0 chip is used in this helmet headset, which has high-fidelity stereo sound effect; and it has a power display to remind the power situation and timely charging.A hands-free call function in this helmet headset can really free your hands for safe riding; two 450mAh batteries are built-in to ensure standby and working time.Made from ABS and electronic component material, the product is durable and lightweight.The length of the product is 4.88 cm, the width is 4.88 cm.It is very convenient for motorcycle driving, bicycle cycling, snowboarding, skiing, etc.Item Name: Helmet HeadsetMaterial: ABS,Electronic ComponentBT Version: 5.0Frequency: 2.402GHz-2.480GHzBT Distance: 10m-20m (Depending On the Environment Around the Device Such As Obstacles)Microphone Transmission Distance: Less Than or Equal to 1mLi-Ion Batteries: 2 x 3.7V 450mAh BatteriesPlaytime: Less Than or Equal to 16 HoursCharging Voltage: 5VCharging Time: About 3 HoursStandby Time: Less than or Equal to 720 HoursBT Pairing Name: BT23Features: Noise Reduction, Easy Operation, WirelessSize Details: 4.88cm x 4.88cm/1.92" x 1.92" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Helmet Headset1 x Micro USB Charging Cable1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin