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?&?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?&?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?110-240V??50/60Hz?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