... lithium battery, AC and DC. 4, support for SD card storage picture, to facilitate the preservation of evidence. 5, support ... tri-band GSM 900MHz, 1800MHz, 1900MHz wireless networks, wired telephone network from the outside alarm limits. 21, supports GSM / CDMA ... Email mailbox. 26, transmitted color images to the computer network management center through the Internet site after the alarm 27, the user ...