With Knock Sensor, a bright flashing light will alert you when someone knocks at your door. Sensitive to vibrations only, the Knock Sensor will not pick up other outside noise. Light will automatically shut off after five seconds. Metal clip on door bracket (as shown) sold separately.
- Does not send a signal other than a bright flashing strobe. You must be in line-of-sight to see it. <
- Bright strobe light requires one 9 volt alkaline battery (not included). The system has a two-position sensitivity setting and will not pick up outside sounds.
- Attaches to the inside of any door with a self-adhesive velcro strip (included).
- Dimensions: 5"(h) x 3" (w) x 1.25" (d)
- Strobe: 2" x 1.5" x .75"
- One year warranty