Work Principle of aluminiue tube sonic mole repeller:

The  Best Mice Repeller works on gopher, vole, shrew and other destructive rodents. works in the garden, Lawn.

It chases away mole and other ground rodents with sound  waves instead of poisons. This repeller emits an intermittent combination of underground sound and vibration every 40 seconds. That mole and other burrowing rodents can't stand. How ever, it won't disturb househole pets.  

The Advanced Solar Powered Mole Repeller has high spec solar panels and an aluminum tube.

The aluminum tube give more durability and makes it easier to insert in the soil.

 More importantly, aluminum is a better conductor of the repelling vibrations.

It with battery case and variable frequency can prevent the immunity of the moles,and also have LED light can brighten your garden.  3 different working models as below:

 First two days, it will sound like “Di” long for 3~5 seconds, interval 50 seconds or so

 Second two days, it will sound like “Di Di Di” in 3~5 seconds, interval 50 seconds or so

 Third two days, it will sound like “Di Di Di Di Di” in 3~5 seconds, interval 50 seconds or so.

 From the seventh day will copy from the first two days and circulate. Work power can insolate one day then continue works 3 cloudy days).

• Weatherproof solar powered mole repeller
• Solar panel: 4v 4.5ma; 70*90mm
• Includes 1pcs 1.2V 800MAH Ni-Cad rechargeable battery
• Safe for children and animals
• No maintenance required
• Covers up to 650 square meters
• Continuous operation
• Unique materials plus UV, anti-ultraviolet, will not change color 

Product pictures of aluminiue tube sonic mole repeller: