ultrasonic wave 1 led key chain 2 PCS AG13 batteries NO chemical, no odor, non-toxic, respects the enviroment.2 functions:1. ultrasonic mosquito repellent : you have to put it into operation switchit emits a frequency of 20-45 KHZscope: a radius of 1.5MIt can lead hung on the belt, purse,in the baby 's stroller in the car.Has myriad appliance.2. LED lightpressing the botton mosquito repeller