Black TPU Wristband and Black Watch Plate. Device (including the base, excluding the strap): 61.3 mm x 21.4 mm x 13.8 mm Headset: 45.1 mm x 18.3 mm x 12.3 mm, Device: Approx. 30 g (including the strap) Headset: Approx. 11.5 g, Display 0.91"" OLED non-touch screen, IP 57  water-resistant, Battery 91mAh;Maximum talk time: 6 hours, Maximum working time: 3.5 days (depends on user habits),Micro-USB charging port,BT4.2, 2.4 GHzOne side button, Android 4.4 and later or IOS 8.0 and later, Call & Message Reminder, Android 4.4 and later or IOS 8.0 and later