BT26 Outdoors Waterproof 500m Intercom Motorcycle Helmet Bluetooth Headset 1. 500m Intercom Range:Advanced intercom functionality allows clear communication between riders up to 500 meters apart, enhancing group ride experiences. 2. Universal Helmet Compatibility:Specially designed to fit both full-face and half helmets, ensuring a perfect integration with your existing motorcycle gear. 3. Bluetooth-compatible 5.4 Technology:Utilizing the latest Bluetooth-compatible 5.4+EDR, this headset offers superior signal transmission, ultra-low power consumption, and compatibility with all Bluetooth-compatible devices. 4. Auto-Answer Functionality:Featuring automatic call answering, allowing for hands-free operation to maintain safety while riding. 5. Waterproof and Noise Reduction:Built to withstand various weather conditions with waterproof design, while noise reduction technology ensures clear audio even at high speeds. 6. Enhanced Bass and Freeze Resistance:Delivers rich, low-frequency sound and is designed to operate efficiently in cold temperatures, ideal for all-season riding. Specifications: 1. Bluetooth-compatible version: 5.4+EDR 2. Frequency range: 2.402GHz-2.480GHZ 3. Transmission distance: 15-15 meters (depending on the device) 4. Microphone transmission distance: Less than or equal 1m 5. Lithium battery: 3.7V1000mAh 6. Continuous working time: Less than or equal 20 hours 7. Charging voltage: 5V 8. Charging time: 3 hours 9. Standby time: Less than or equal 80 hours 10. Intercom distance: 500 meters 11. Bluetooth-compatible name: BT26