3-button pocket-size transmitter includes 2 command buttons and green laser pointer. It contains two sets of batteries, 2 CR2032 (20 mm) coin cells for transmitter and separate high amp-hour battery (CR123) for laser. This assures virtually unlimited life of transmitter and up to 25 hours for laser. Wireless transmitters operate on 433 MHz. They transmit on any of 16 different channels. Range exceeds 300ft (100m) in the noisiest RF environments. Users have reported greater range.