7 Day Programmable Timer Switch- Pool/Gate/Sprinklers/Lights- 120v Input - ET3 Substitute 7 Day Programmable Weekly Timer Switch - 120V Input Internal Battery Backup - Will Not Lose Programming During a Power Surge Works Great For Pools, Sprinklers, Lights, Gates, and Much More. Uses Quick Disconnect Wire Terminals Substitute for ET-1, ET-2, ET-3, TE-501