Features:Internet positioning service center， used to receive and send positioning information. GSM / GPRS modem supports Quad frequency bands， 850 / 900 / 1800 / 1900 MHz. Can work effectively in limited space such as urban canyon. Low energy consumption. Fast signal acquisition.Support iOS Android phone App to control.Support single positioning and continuous tracking. Support alarming and remote monitoring. Support fast dial button. Support the location information inquired by SMS and Internet. Built-in 500mA battery.About 3 days operation time.Monitor without disturbing the tracked person and realizes real-time tracking. Can position the holder by call or SMS. In emergency， press the SOS button to have an accurate positioning.How to use:1. Insert the SIM card in the card slot and starting up.2. Through the Web platform: Enter the Web platform: http: // www. gps112.com3. Then input tracker's IMEI (last 10 digits) and passwords (123456). So that we can view the history records.Note:Open the website http://gps112.net/index.aspx?lang=en in computer， and scan the two-dimension code， and download the App. Type: Tracker GPS Bands : GSM 850/900/1800/1900MHz GPRS : TCP/IP Network : GSM GPS Sensitivity: 10m (2D RM) Package weight: 0.187 kg Product size (L x W x H) : 4.4 x 3.7 x 1.3 cm / 1.73 x 1.45 x 0.51 inches Package size (L x W x H) : 12 x 10.8 x 3.4 cm / 4.72 x 4.24 x 1.34 inches Package Contents: 1 x TK101 Car GPRS GSM GPRS Tracker1 x USB Cable1 x User Manual in English and Chinese1 x Power Adatper， 1 x Earphone