Niceroker Womens Bluetooth Waterproof Steel Bracelet Smart Watch for IOS Android Sport Calorie Counter Golden Waterproof Standard: IP-X6 Appearance material: Strap: Soft compatile For system: IOS 6.1 and later ; andorid 4.3 and later display screen: OLED 64*32 Bluetooth version: 4.0BLE (low power) Memory: 64KB RAM + 64KB ROM