Theory

it emits ultrasonic wave at a frequency to repel pest,one of our advantage is that  powered  by solar,convert solar enery into rechatgeable battery.

Frequency A ( 7HKZ)Mosquitoes, fleas

Frequency B ( 10HKZ) Flies,mice,rats

Frequency C( 12HKZ) Cockroaches

 Wide usage:

home, car, outdoor,especially useful  for  mountain climbing, fishing, camping, picnic, tourism,especialy can charged in the car.