Best partner of cell phone, support answer / call / hang up, built-in Speaker and Mic to answer calls directly. Synchronize through Bluetooth, answer call by pressing a button. Caller ID and LED Time Display. When smart phones connect with the bracelet through bluetooth , you can enjoy the music automatically synchronized via the bracelet. The bracelet vibrates when a new message comes and you can read it directly on the bracelet's screen (sms reading ongly works for android phones with APK installed). Anti-lost: Alert when the watch is moved away from your phone over a certain distance. The top-rated 250mAh battery enables you run into the bracelet for 168 hours constantly. L12S can clearly displays steps, calories and distance when the pedometer function is turned on.