• Transmitter and receiver create an infrared beam up to 20 metres.
• Alarms if someone moves through the beam.
• Three volume level settings and alarm tone, two distance settings.
• Easy to align with LED indicator lights on both units.
• Low battery warning signal. Each unit measures 9.5 x 7 x 2.5cm.
• Each unit uses 1 x 9v battery (not included).

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