Replacement timer chip for ESB 20 Minute BEEP timer. CHIP ONLY! NO Timer Included! Works for 120 Volt / 240 Volt timers. Timer chip for ESB brand beds with digital timer ONLY! *If your ESB 20 minute timer is glitchy, replacing the timer chip may or may not help. **Timer needs to have a socket for easy installation. Timers without a socket will have to have the chip soldered into the board. *** New timers with chips already installed can be purchased in our store.