Global minimum ShouBiaoShi GPS positioning, more personal safety, the old man's more assured. JTD(shenzhen) GPS terminal and geographic information system platform for children and the elderly combination can provide comprehensive activity trajectory tracking, can know where they are now and get peace of mind at any time Products function : call (default), to answer, SMS/GPRS communication, remote monitoring and emergency SOS, show status information (speed, coordinate and altitude), text inquires the position and track record and playback, trajectory tracking, discrete time continuous/electronic fence support functions, beyond the specified scope alarm, real-time tracking control 30 sets to a box,the weight of a box is 0.5 kg