ProTimer automatically turns your pump on and off for desired circulation and aeration. For use with any livewell recirculation pump or Flow-Rite valve V system with "RECIRC" mode.. Automatic operation increases fishing time. Ideal for tournament fishing. Adjustable time delay feature to meet specific ambient conditions. Conserves battery life, is easy to install and easy to operate. Color coding promotes ease of proper operation. Self-adhesive backing for easy installation; eliminates mounting screws. Weather resistant Poly coated circuit board