Note: The 4G Kids Smart Watch support Nano sim card which same as your smartphone. 4G Smart Watch Kids Camera GPS WIFI IP67 Waterproof Child Students Smartwatch Video Call Monitor Tracker Location Ph more→one Watch Features: 1. The 4G network version:GPS+ WIFI+LBS positioning, Locate more accurate; 2. Memory:RAM:2GB; ROM:4GB 3. Battery:Lithium battery 650mAH 4. The 4G network version:4G Network, VOLET Video call,Voice call,remote monitor, access internet by WI-FI ,LTE GPRS Data.connect more fast and stable; 5. Supports video call,Pixel:30W 6. IP67 waterproof design(Please do not use it in hot/salt water,hot shower,swimming or diving!) 7. 1.4 Inch HD color touch screen, full fit IPS