Features: In case of emergency, press the SOS key, that is, to send a call and information to the protector for help. Turn off/on GPS and data charging in time. Set the time range without interference through the protector cell phone application and protect the incoming calls of the device. Ahighly sensitive microphone monitors the surrounding sound in real time in case of emergency. If you have any questions after receiving the product, please feel free to contact us and we will provide you with a satisfactory answer. Specification: Size: 106*75*42mm Weight: 96g Charge input: 5V Communication frequency: 850/900/1800/1900MHz Positioning mode: WIFI+LBS+GPS Platform view. SMS+APP+PC Operating temperature: -20-85 C/-4-185 C includes: 1 * GPS Tracker