Cado Pets GPS Wifi Anti-lost Tracker Collar Geo Fence Waterproof Rolling Led Lights with App (Grey) SIM CARD REQUIRED. 2G/3G sim card support to use AT&T ,T-Mobile sim cards support LIVE TRACKING AND HISTORICAL ROUTINE FEATURE. GPS+LBS+AGPS+Internal 4 intelligent positioning mode. 0-50 Feet positioning accuracy. Review the ever routine of your pets. Virtual Fence Alerts and low battery alarm will appear on the free apps SEARCH PETS QUICKLY. Cado GPS notifies you if your pet is away from their safe zone, a customizable safe area you designate for your home or office, and allows you to pinpoint and track their location directly from your smart phone (iPhone, Android). Smart LED light will automatically turns on when in dark environment WORLDWIDE COVERAGE & MULTI-FUNCTIONS. Cado uses cellular and GPS technology to pinpoint your dog's location anywhere you get cell service in the world. GPS pet tracker with powerful location monitoring and an extremely high technical specification - follow the footprints of your beloved kitten, puppy, or pony. Track children, pets, vehicles, elderly, valuable items + much much more FLEXIBLE AND PORTABLE. The size is 1.85" x 1.97" x 0.6" and the weight is 40g. Recommended for pets above 4.5 kg (9 pounds)