Remote for Interval Timer - HH-IR4 Spare Remote for our Interval Timers: Model # JI2B+1.8R & JI4D-4R Great to have a second remote for multiple coaches or in case your remote gets put out of the game Remote Model # HH-IR4; Takes CR2025 Battery (Battery not Included) Will work with our clocks (Matters of the Cart). We cannot guarantee that this will work with any other clock.