Mosquito Repeller Neck Type feature:
1. Power: 2xAAA 1.5V Batteries (not included)
2. Operation current: less than 10MA
3. Male mosquito mode frequency: 17KHz~20KHz 
4. Dragonfly mode frequency: 35Hz 
5. Alarm for emergency,sound output up to 90dB  
6. 2 repel mode for different condition
7. Flash light switch option

1.Slide the switch to "Dragonfly" position,this unit generates ultrasonic signal to simulate the wing-flapping sound of the dragonfly to repel the mosquito.Slide the switch to "Mosquito"position,the unit generates ultrasonic signal to simulate the sound of male mosquito to repel the biting female mosquitoes.Addressing the specific use environment,choose proper mode for better use.Slide the switch to "Alarm"position,this unit will sound beeps for alarm.
2.Slide the switch to "OFF" position to turn off the unit.
3.Press down the black button to turn on the super bright LED