You will get a Free SIM card that will minimize monthly maintenance cost to about $5 For each additional watch monthly maintenace cost will add just $5 Wireless coverage is provided mostly by T-Mobile, In case where T-Mobile is not avilable, service will be provided by any available GSM provider (data is required for device positioning, while roaming data might be not available with other providers) IP67 rating ensures "ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time (up to 1m of submersion)" according to the IEC. Read more at http://www.trustedreviews.com/opinions/what-is-ip68-ip-ratings-explained#JaMlom5UIBsc7P1B.99 WiFi+GPS+LBS positioning SOS emergency and parents call, monitoring number call, Two-way conversation, voice chat, dedicated phone book, Historical route, Monitoring, Remote Shutdown and wake scheduling, Alarm, Lower battery reminder, Geo-Fence and many more other features

• TOUCH SCREEN: High resolution touch panel, touch and swipe to control, easy for kids.
• PHONE CALLS: Two-way communication between you and the kid. Up to 13 Contacts
• LOCATOR: WiFi + GPS + LBS 3-way locators to provide the accurate real-time location information. Bluetooth anti-lost
• COMPATIBILITY: iPhones and Android. supported by T-Mobile, Metro PCS, Ultra Mobile GSM networks.
• Waterproof,

TOUCH SCREEN: High resolution touch panel, touch and swipe to control, easy for kids.NEXTEK