Features: Dial through the mobile phone number in the device 1-5 seconds access talking mode plug in earphone then you can communicate with each other. Press SOS it will dial combined mobile phone number(1 to 9) Applications: Vehicle rental !#!amp!*! Fleet management etc Protect child the old the disabled pet etc. Manage personnel Track criminal secretly etc. 1. SMS Positioning 2. Dialing Positioning Dial the cell phone number in the device after get through and hang up this device will automatically return current position and a map link as well. 3. Set !#!amp!*! Clear E-fence 4. Track Playback 5. SOS Call settings Note: This device can store 9 called mobile phone number serial number is (1 to 9) 6. Voice Call Basic Parameters: 1. Operating frequency: GSM 850/900/1800/1900mHz 2. input: AC 110-240V50/60Hz 150mA output: DC 5V 300-400mA 3. Standby time:7 days Specifications: Original box:Yes Size: about 42x37x13mm(GSM tracker) Package Size: about 104x68x37mm Net weight:85g Package weight:95g Color:Black Package included: 1 x GSM tracker 1 x Charger(US) 1 x USB cable 1 x English user manual 1 x Chinese user manual