Mouse Trap Audible Alert System | Connects to most Snap Traps | Emits 1 second alert tone every minute when mouse is caught | reusable | 2/pack Snap Trap Audible Alert System with included AAA batteries. 2 per pack. A one second chime is played every minute to alert that a mouse has been caught. Eliminates the need to constantly check traps. Perfect for basements, garages, sheds where a trap with a mouse may otherwise remain undiscovered for days or weeks (yuck!). Easily attaches to most wooden and many plastic mousetraps (not included),.