Mini pabx Capacity: Basic 4 CO lines, 8 extensions (408), ... , 424,432,832,896,1288,1696,1680 Transfer caller ID Mini pabxCapacity: Basic 4 CO lines, 8 extensions (408), expand ... 0 ~ 55 centigradeEnvironment Humidity: 20% ~ 90%Store Humidity: -20%~85%Cable Length of Key Phone <300M (2 pairs twist with 0 ... .5@)Cable Length of Single Line Phone < 1000M (2 pairs twist ...