... the phone dvr alarm system,Campus network video alarm system,camera alarm, 3g alarm, alarm, alarm system, wireless alarm,home...Usage ... or 8ch dvr alarm system,Campus network video alarm system,camera alarm, 3g alarm, alarm, alarm system, wireless alarm,home 4ch ... detectors8 preset alarm linkage for each video channel, built in PTZ control keyboard2 piece message record(40 seconds each) by locally ...