The only bow light that produces a mouse squeak for calling in predators. This is not a long range call, it's for calling in predators that are inside of 100 yards. Rechargeable Batteries The Tim Wells Slocker Bow Light Package comes with 1 - Tim Wells Slocker Bow Light that mounts in place of your stabilizer(Simply screws in the same spot as stabilizer) 1 - built in Sound module that produces a mouse squeak at