Ultrasonic protection for out-of-reach areas. Mouse Repellent. The Big Cheese Anti Mouse Battery Powered Mouse Repellent is ideal for areas away from mains power ie. Loft spaces and sheds. This portable sonic repeller provides continuous output. Also suitable for holiday homes and caravans. It is a welfare-friendly deterrent and has a low battery indicator. Requires 3 x AA batteries (not included) and lasts for over three months.