Bluetooth 5.1 Adopting latest Bluetooth 5.1, the transmission of K18 headset is faster, more efficient and stable. You can move freely with up to a 59 ft (18 m) range. Headset features multipoint technology, enjoy the convenience of having up to two devices connected at once. Compatible with iPhone, Android, tablets, laptops, and other leading smart phones. CVC8.0 Dual Mic Noise Cancelling K18 bluetooth headset features CVC8.0 Dual mic noise cancelling and ENC technology, knocks out 96% noise and delivers clear voice. Enjoy clear calls. Clear Voice K18 bluetooth earpiece adopts Echo Cancelling and Consistent Voice Quality technology for clearer calls. Consistent Voice Quality technology conceals Packet-loss and bit error effectively to ensure consistent voice quality even in situations where bluetooth connectivity may be compromised. Hope you enjoy consistent clear call. Ultra-Long Battery Life With up to 12-16 hours of continuous talking on a 1.5 hours single