Main Function: Mini GPS Tracker GSM Frequency Bands: 850/900/1800/1900 MHz GPS Sensitivity: 159dB Start Up Times - Hot Start: 45 seconds (avg) - Warm Start: 30 seconds (avg) GPS Positional Accuracy: within 10m Typical Active Battery Life: >48 hours Power Source: Li-ion Rechargeable Battery (870mAh) Dimensions: 7.1 cm x 4.3 cm x 2 cm (L x W x D) The Mini Quadband GPS Tracker with Messaging is an indispensable device when your family"s safety is your number one priority. This GPS operates on the GSM frequencies of 850/900/1800/1900 MHz. This compact GPS offers peace of mind to those wanting to protect their loved ones or important belongings. Place one in your child"s school bag in case they become lost or worse so you will always know where they are. It is especially when your young children go on school trips and you can"t be there to watch over them. This device can also reassure you that your older children are indeed at the library doing research and not at the mall with their friends. Adult children will also appreciate being able to keep track of their elderly parents who may become lost. The GPS Tracker"s innovative loop design allows it to be attached to a strap, making it easy to carry. It can also simply be attached to a pet collar so you"ll never have to spend hours searching all over the neighborhood for a lost pet. Some owners even uses the continuous transmission feature to track their pet"s movements throughout the day. Another great use for the GPS Track is to hang it off your belt when hiking or exploring a remote location. You can easily transmit your coordinates to a friend at regular intervals to ensure your safety while you focus on enjoying the great outdoors.