KASSICA Bluetooth Smartwatch Waterproof Smart Wrist Band Sports Outdoor Fitness Tracker Sleep Monitor Call Coming/ EMS Reminder Smart Bracelet Compatible With IOS 7.0+ and Android 4.3 or Above (Black) Track steps, distance, calories burned, and monitor how long and well you sleep. With a gentle touch on the screen, recorded data will show in sequence. It's compatible with iPhone/iPad with IOS7.0+ system (but sometimes iPhone4 does not work reliably, iPhone 4S and later model works great) and Android phone/tablet with 4.3+ system Vibration reminds you of alarm clock and fitness progress without waking up others or disturbing people near you. IP67 waterproof means there is no need to take the tracker off during swimming (up to 30 minutes) or showering. It is also totally protected against dust. IP67 waterproof means there is no need to take the tracker off during swimming (up to 30 minutes) or showering. It is also totally protected against dust.