Door access control NFC Obsidian Smart Watch combines fashion and functionality in one device. Stay on top of your fitness goals, receive notifications, and monitor your health with ease. Ideal for daily wear and sports activities. Specifications: Wireless version:5.3 Screen size:1.53-inch; Touch type:Full touch screen OGS Resolution:IPS 360*360 Memory:RAM:640+32KB ROM:64 M; Compatible system:Android 5.0 system and IOS12.0 above; Battery capacity:315mAh Use time:4 days; Charge time:200 minutes; Charging method:Wireless charging Door access control