Product_description: ["Features: Battery Operated Transmitter with On/Off Buttons. Battery Operated Receiver. Operational range of up to 20'. Receivers will learn up to TWO additional Skytech Transmitters. About the Product: This user friendly, battery operated unit is operated manually from the transmitter (handheld remote). The transmitter has two buttons, on and off, and the system operates on radio frequencies within a 20’ range using non-directions signals."] (Page 1)