Screen size:1.54" 240*240 screen, Capacitive Touch Screens
Bluetooth:BT3.0/BT4.0
Product size:41*47*9.18mm
To sync the notifications of your phone, your phone need to install the APK software (Only android system can download APK).
For Andorid phone, every function mentioned can be used, but for IOS phone, only Sycn phone call, E-compass Navigation, Sleep quality monitoring, Anti-lost, Music play, Look for phone and Pedometer