LDSM640

LDS M640 battery-powered rodent repeller with variable ultrasound, a night light and a vibration sensor. No wiring needed. How it works, where to put it and what its sounds and lights mean.

Status
Current model
Sold as
M640
Setup help

How the M640 works

The M640 runs on six AAA batteries, included, so it needs no connection to your vehicle's wiring. It's a sound-and-light repeller, with no shock plates.

  • Variable ultrasound: once a minute it sends about 5 seconds of sound, shifting between roughly 12 and 24 kHz. The pitch keeps changing, which is meant to make it harder for animals to get used to. Some people can hear the lower tones.
  • Night light: a blue LED flashes automatically at dusk and through the night.
  • Turns itself off: a vibration sensor switches it off when the engine starts.
  • Battery life: about 12 months from good alkaline AAA batteries. It draws about 1 mA while it runs and 5 µA on standby.

Sound on its own isn't enough. Rodents get used to a noise when nothing bad follows it, so treat the M640 as an extra layer alongside capsaicin tape and a plate unit, not as your only protection.

More answers for the M640

Where to put the M640
  • In a stored vehicle: put it in the engine bay, or wherever rodents have been getting in, in a dry spot away from the exhaust and other hot parts.
  • In a garage, shed or cottage: it covers roughly 40 m² of enclosed space.
  • Aim it: ultrasound doesn't travel through or around solid objects, so point the speaker at the area you want to protect, with nothing in the way.
  • Keep it dry: it's splash-proof (IP44), not waterproof. Keep it out of direct spray, and dry it off if it gets soaked.
Batteries, the blue light and the sounds
  • A steady, continuous tone: the batteries are running low. Replace all six.
  • Blue light at night: that's normal. It flashes automatically at dusk and overnight.
  • Cold weather: battery life drops in the cold, so check it more often over the winter.
  • On/off switch: switch it off when you don't need it, to save the batteries.