Anti-lost & Real Time Locator: This Pet Activity Monitor Tracking Device uses an advanced GPS and LBS Location tracking system by using a SIM Card (NOT INCLUDED) with 2g GSM network to help you find your pet wherever they go. GPS + LBS + Wifi Positioning: Allow the location to be pinpointed in real time or periodically. You can take it easy even when your dog or cat runs out of your sight. 2-Way Audio: Stay connected with your cat or dog from anywhere! With 2-way audio you can call them home, reassure them when you are away, and hear them respond, giving both you and your pet peace of mind even when you are apart. Sensor Lights: When the environment gets dark, the tracker device opens an LED flash automatically making it easier to see your pet. Waterproof and Light Design: The GPS collar weighs only 50 grams. Your pets will be comfortable with it. The neckband can be adjusted. A must have for pet owners who want to be connected with their pets at all times!