Solo Man Overboard Alarm System. (does not shut off motor, sounds loud pulsating alarm) Great for sailboats, large motor boats, or anyone towing a dinghy. Also can be used around a pool, campsite, or at the beach. This system includes: 1 loud pulsating alarm (105 db), 1 receiver, 1 personal sensor, AAA batteries, Owner's Manual, & Velcro strap