Features: brand new and high quality Bluetooth-compatible 5.1 provides instant pairing and stable transmission without interruptions. Using upgraded dynamic coil speakers to enhance the sense of depth, presence and space, and present a three-dimensional surround effect like a live scene. Connect to GPS navigator wireless via bluetooth,listen to navigation prompt information in earphone in real for time. Can be used while charging. IP67 water resistant,allows for universal pairing. Suitable for all types of motorcycle helmet. Specifications: Material:ABS Color:Blue,Gray,Orange Bluetooth-compatible Version: 5.1 Battery Capacity:800mAh Playing Time:up to 22Hours Standby:About 33Days Talk:CVC Call Noise Reduction Intercom Distance:About 800-1000meters/2625-3281ft FM:Support Number of Intercoms:2 People Noise Reduction Ability:120KM/H Speed Package Includes: 1x Headphone 2X Mounting Bracket with connected speakers and spring clip 1xUSB Cable 1X Boom microphone note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.