The B4U Standard Detector Base features twist and lock detector installation and is compatible with Edwards Intelligent detectors. The base does not require a separate address because it shares the address of the device it is connected to. Specs Manufacturer Utc Fire & Security Edw Condition New Operating environment: Temperature: 32 to 120F 0 to 49C Humidity: 0 to 93% RH, noncondensing at 90F 32C Storage temperature range: 4 to 140F 20 to 60C Compatible detectors: E PD, E PHD, E HD Compatible electrical boxes: North American 2 1/2 in. 64 mm deep, 2 gang box Standard 4 in. square box 1 1/2 in. 38 mm deep box Wire size: 12, 14, 16, or 18 AWG wire 2.5, 1.5, 1.0 or 0.75 sq. mm Sizes 16 and 18 AWG are preferred Base diameters: 6.0 in. 152 mm Height from box including detector : 2.08 in. 53 mm Maximum distance from ceiling wall mount : 12 in. 305 mm