David Lian women's smartwatch New York collection with 38x45 mm rectangular silver case with bevelled corners, 1.69'' full-touch screen with 240x280 resolution, gray silicone strap, IP67 certification, 160KB+128MB RAM memory, BT5 Bluetooth version .0+ BT3.0 BLE. Rechargeable lithium battery via USB cable included in the package. Battery life: 10-15 days depending on usage. Compatible for Android and iOS systems.