Make: Bosch Model code: DS455Q Dual/ Quad Technology: Quad Technology Detectors Infra Red Beams: Yes Coverage/ Range m: Indoor: 250 / Outdoor ... If the beam is broken, the receiver signals an alarm.

The DS422i and DS426i are dual-beam photoelectric detectors designed for indoor and outdoor applications. Consisting of a separate transmitter and receiver, they are designed to activate an alarm when ...