I have a probleme with my tracker hi-603x. When I connect that into the power supply, and I connect GSM and GPS antenna, green led was on, yellow led blink but red was off. In the GPS antenna, I see red led is on. But when I send " #0000,10 ", I receive this response: "$T131113R2,GPS,V,S,00"00'00.00,W,000"00'00.00,0,0,160601,065615*(http://maps.google.com/maps?q=0,0 ". And when I let this connection after 2 days, green led was off. And after severals hours, the tracker send me low battery and was off. Can you help me to resolve this problem? I have the same problem with 6 trackers.