This is a fixed frequency remote control with EV1527 code, 433 MHz simple pairing, is an ideal choice for controlling of garage doors, doors and other equipments.Features:Build in button battery, providing long service time.Brandnew and high quality wireless remote control.Maximum control distance up to 100 meters in the open air, low interference.1/2/3/4 channel or 1 Button, 2 Buttons, 3 Buttons, 4 Buttons for your choice.It is just a common RF remote controller / transmitter, which works only with remote switch receiver.Specifications:Condition: Brand NewMaterial: Plastic + MetalEncode: EV1527Frequency: 433MHz Channel: Channel1, Channel2, Channel3, Channel4 (Optional)Type: 1 Button, 2 Buttons, 3 Buttons, 4 Buttons (Optional)Remote Control Distance: 0~100mPower Supply: Button Battery (Included)Size: 5.9 * 3.5 * 1.1cm / 2.3 * 1.4 * 0.4inPackage Weight: Approx. 20g/0.7ozPackage Included:1 * Wireless Remote Control ( Button Battery Included)Notes:1. Due to manual measurement, please allow 0-1cm error. Please make sure you don't mind before bidding.2. Because of the differences between different monitors, the picturemay not reflect the actual color of the project. Thank you for your understanding..