Bluetooth Bracelet Incoming Call Alert with Vibration and Anti-lost Alarm for Cell Phone Mobile Compatible with all Bluetooth-enabled mobiles: Bluetooth Version:2.0; Bluetooth Frequency of 2.4GHz Vibrate (every 2 seconds) to alert with the incoming phone call (Not response to SMS) Vibrate to alarm you when your mobile pass away from you more than 10 meters Built-in rechargeble battery, approximately 2 hours charging time and up to 48-60 hours in stand-by mode (Approximately) The tiny LED light shows 2 different colors to indicate its status (Connection, phone call )