Car GSM Alarm SP800U Features SP800U--GSM 900/1800MHz SP800UA--GSM 850/1900MHz SP800US--SP800U+Engine Start SP800UAS--SP800UA+Engine Start Additional remote engine start--SP800US/SP800UAS Installing and upgrading on ODM keyless entry system GSM car phone carried Two remote transmitters carried (option) Learning multi-code design Anti-hijacking Override switch IR detecting False alarm trigger prevention Status LED indicator Echo car by transmitter Built-in high capacity backup NiH battery Designable friendly languages instruction Check the status by phone Message or voice to arm or disarm Call up 3 phone numbers and message once triggered Instant message and call once illegally triggered Return to original mode after re-connect power source Monitor by microphone Shout by speaker Press-a-button to auto call for emergency help