Function: A: can set 6 groups of telephone numbers, can listen-in remotely, can connect with 120db siren exteriorly, can send and receive SMS to arm and disarm remotely, built-in lithium. Can set multi-channel wireless PIR accessories. B: can connect with 1-4 wired video camera C: can connect with 1-4 wireless A/V cameras, wireless signal transimission D: Can compatible with both wired&wireless cameras S: can control the main panel to send MMS for any channel via telephone SMS E: can control the main panel to send MMS for any channel via phone call G: upgraded version 1 has SD memory Card function, the max. is 2G, SD card has both dynamic and static video. H Upgraded version 2 has the WAN function of our Company¡¯s platform, can see through this. I: several groups of password protection J: can change according to customer¡¯s requirements