For iPhone 4S/iOS 7 or higher. Companion App for HOT Smart Watch. HOT Watch lets you make private calls using palm of your hand without the use of Headset or phone handling. Control call using your hand gestures or voice commands, receive texts, email, FB and other notification right on your wrist. HOT Watch comes with 6 axis accelerometer with Gyroscope for you to track how many calories you have burned and is water resistant so you can go out in rain.