Ebest - Mobile Phone Watch(850Mhz, 900MHz, 1800MHz, 1900Mhz) - Watch Phone For Kids with GPS Tracker, Bluetooth, Audio Player, MP3 MP4 Player, Dark Blue GSM Compatibility: 850Mhz, 900MHz, 1800MHz, 1900Mhz Memory: Micro SD card (max 16GB not included) Message Types: On demand GPS location when queried by guardian SMS message SIM Card Slots: 1 Compatible SIM Card Types: 2G, 2.5G