David Lian men's smartwatch Dubai collection with 44x44 mm circular case, 1.3'' full-touch screen with 240x240 resolution, black silicone strap, IP67 certification, 160KB+128MB RAM memory, Bluetooth version BT5.0+ BT3. 0 BLE. Rechargeable lithium battery via USB cable included in the package. Standby battery life: Up to 25 days depending on usage. Compatible for Android and iOS systems.