Control your K-Rain BL-KR Battery Powered Timer and TC-KR Hose End Timer with one streamlined App and Bluetooth Smart Technology. No more crawling around the valve box trying to program or troubleshoot your battery powered timer this app puts full programming control in the palm of your hand. This app allows you to: Transform you iPhone or iPad into a remote control and fully program your BL-KR or TC-KR controller(s) using Bluetooth Smart technology from up to 32 feet (10m) away. Manually start, stop or suspend your controller(s) from up to 32 feet away. Fully configure watering schedules and zones. Detect battery levels and connection status. Add a passcode lock to each controller for added security. The ability to add multiple BL-KR & TC-KR controllers and program/control them using 1 app on your iPhone or iPad. The K-Rain BL-KR Batter Powered Irrigation Controller uses a 9V DC Latching Solenoids, and comes in 1, 2 4 or 6 station models, all rain sensor ready. The K-Rain TC-KR battery powered hose end timer can be used for irrigation or misting and is powered by a 9V battery.