[CSR Bluetooth chip] enables full-duplex intercom, with a maximum distance of up to 800-1000m (without obstacles). After Bluetooth is connected to the mobile phone, priority switching between phone calls, intercoms, and stereo music can be achieved. It can automatically answer incoming calls during intercoms, and automatically resume intercoms after hanging up.[Noise reduction technology] DSP echo cancellation and noise suppression technology ensure clear voice quality at high speeds.[Easy hands-free communication] Equipped with Bluetooth 5.0, you can access Siri and S Voice commands, you can make or answer hands-free calls; listen to Hi-Fi stereo music; FM radio or use GPS voice navigation. A 2.5mm audio jack is also provided as a wired connection, so you can connect the BT-S3 to a mobile phone, tablet, GPS or other device that can transmit music/voice to the headset via a 2.5mm to 3.5mm audio cable.[Convenient] Suitable for any full-face helmet and most half helmets that can cover the ears. Larger buttons make it easy to operate even when wearing gloves. The earphones are connected with a buckle type connection between the clip, which is easy to assemble/disassemble.[Excellent waterproof performance] It is waterproof with full silicone. Even in rainy or snowy days, it will not affect its use, making your outdoor riding more exciting.