The product can be used not only as wireless motorcycle intercom helmet headset, but also as wired motorcycle helmet headset. The technology uses a range of frequencies that are available globally to ensure communications compatibility around the world. You can connect your headphones to your phone or any device which uses bluetooth wireless technology that supports "headset" or "hands-free" configurations. Features: 1. It can achieve direct full-duplex intercom between two riders about 800-1000 meters. 2.Mobile phone control function: can receive and dial the phone, refuse the phone and hang up the phone. 3. Automatic phone answering function. 4. Support FM radio function. 5. Support for voice switching. 6. Stereo music control function. 7. Enjoy music that transmits from mobilephone or connect to GPS via through A2DP. 8. Automatic switching function of each state: you can control the last song, next song, play and pause of music through AVRCP. 9. It can achieve Bluetooth mobile phone, intercom call, stereo music and FM radio automatically switch. 10. DSP noise elimination and wind treatment to ensure clear voice quality when you are in high speed running. 11. Button panel is waterproof and sun-proof which is durable. 12. Support final code redial. 13. Connect MP3, GPS, cell phone, intercom and so on through audio cable. Specification: Item Name: BT-S2 1000m Bluetooth interphone Model: BT - S2 Weight: 315g / 11.1oz Size: Approx. 8.5 * 5 * 2cm / 3.3 * 2.0 * 0.8in Bluetooth version: 3.0+EDR Working frequency: 2.4Ghz Support Bluetooth protocol: A2DP, AVRCP Support Bluetooth function: Bluetooth headset with automatic detection and hands-free function Working range: 10m maximum (mobile phone) Battery type: 450mAh rechargeable lithium battery Standby time: ≤300 hours Call time: ≤10 hours (mobile phone) Conversation time: ≤8 hours (intercom model) Charging time: ≤3 hours Power charger: DC5V 500mA Package list: 1 * Bluetooth Headset 1 * Charging Head 1 * Charging Cable 1 * Audio Cable 1 * User Manual 2 * Patch 1 * L-type Screwdriver 1 * Screw 1 * Headset + Microphone device 1 * Back Clamp Note: 2) When charging, the module on the red LED headset will be illuminated. When charging is completed, the red LED will be extinguished. Note: If you do not use headphones for a month or more, charge them at least once a month to protect polylithium batteries. (The wrong charge made THE damage will not be guaranteed)