4pcs Ultrasonic Pest Repeller - 1-75KHz Adjustable 6 Levels, Repels Bats Birds Mice, 753Sq.ft 37538788This rechargeable ultrasonic bat repellent effectively deters bats, birds, and mice, creating a pest free space indoors, outdoors, or while camping. Designed with dual ultrasonic speakers, it uses 1 75KHz ultrasonic waves with 6 adjustable levels to target their behaviors. Built in a 950mAh rechargeable battery, provides 70 80 hours of runtime, covering up to 753 sq. ft. Safe and humane, it uses no chemicals, protecting kids and adults while avoiding