T500 SmartWatch + Extra Metal Strap - Bluetooth Call - 44mm - Android / iOS - Pink/GoldAbout this itemCall - You need to download the Hiwatch app to make calls and be able to use all functions.Bluetooth - The cell phone cannot be a long distance from the watch because bluetooth is used and it disconnects.Sleep MonitorNotifies receiving messagesHeart Rate Monitor,/li>Visible screen diagonal2," /..