Battery-operated mosquito repeller - awesome!! These Ultrasonic Mosquito, Midge and Flying Insect Repellers fit in the palm of your hand and can be used indoors or outdoors, attached to a belt or handbag or stood on a table. They are safe for children and pets and are kind to the environment, non-toxic, no chemicals or bad odours. The units are for individual use only and results may vary due to factors such as body chemistry or lotions/fragrances on the skin. Battery included.