| Material: | High impact ABS plastic enclosure | 
| Dimensions: | 8.4 cm x 13.3 cm(3.3 in. x 5.25 in.) | 
| Operating Temperature: | -29°C to +49°C (-20°F to +120°F)For UL Listed Applications, 0°C to + 49°C (+32°F to +120°F) | 
| Radio Frequency Interference (RFI) Immunity: | No alarm or setup on critical frequencies in the range from 26 MHz to 950 MHz at 50 V/m. | 
| DS938Z: | Complies with Environmental Class II (EN50130-5) | 
| Height (recommended): | 2.5 m to 6 m (8 ft to 18 ft) | 
| Location: | Mounts directly to ceiling or to standard octagonal electrical box. | 
| Internal Pointability: | Coverage is adjustable ±10° horizontally, +2° to -18° vertically. | 
| Alarm: | Form C reed relay at 3.0 W, 125 mA at 28 VDC for resistive loads | 
| Tamper: | Normally-closed. Contacts rated at 28 VDC, 125 mA maximum. | 
| Alarm: | Signal through POPEX data bus. | 
| Tamper: | Signal through POPEX data bus. Signaled as missing. | 
| Trouble: | Signal through POPEX data bus. | 
| Current: | 18 mA at 12 VDC | 
| Voltage: | 6 VDC to 15 VDC |