Features: High Power Load: The Relay Adopts 40A Relay, Which Can Load High-Power Electrical Appliances To Ensure Long-Term Stability Control. (Note: Max Load: 30A) Strong Signal: Adopts Rf Technology, It Can Pass Through Walls, Floors And Doors, Control Receiver From Any Place Within A Reliable Distance. Max Range Is Up To 3000m With No Obstacle. Easy To Control: Learning Code Has High-Level Security For Its Low Repetitive Rate And Re-Learn Mode, It Can Delete The Old Code And Re-Learn A New Code. There Is A Switch Key On The Relay. If The Remote Control Get Lost. You Also Can Always Control Of It. (When In Using, A Plastic Slider On The Side Of The Remote Need To Be Moved Into A Particular Position.) High Sensitivity: -114dbm, Stable And Reliable Performance, High Receive Sensitivity And Anti-Jamming Capability.（Note: Please Don' T Put It In A Metal Waterproof Box, Otherwise There Will Be No Signal.） Wide Application: This Long Distance Remote Switch Is Used In Pumps, Mud Pumps, Motors, Lamps, Fans, Insecticide Machines, Sprayers, Car Washers, Bells, Etc. Various Types Of Electrical Equipment . The Relay Adopts Transformer Isolation And Does Not Carry High Voltage When Outputting. Ensure That The Voltage Is At A Safe Voltage Of 5V. You Can Use It Safety. 3000 Meters Of Remote Control Distance, Easy To Work In Garden Square Farms And Even Factories. 3000W High Power, Enough To Meet The Use Of An Electric Water Heater And High Power Pumping Unit.  Specifications: Voltage: AC100V-AC240V Max Load: 30A Radio Frequency: 433mhz Working Distance: 3000m Cable Length Of Antenna: 3m Receiver Sensitivity: -114dbm Rated Power: 3000W Code Type: Learning Code Remote Control Battery: 1* 6F22 9V Battery(Battery Included) Learning Methods: Self Locking Mode: When The Controller Is Powered On, Hold Down The Learning Button And Wait For 3 Seconds. The Indicator Light Will Flash Once. Release Your Hand And Press The Button On The Remote Control. The Indicator Light Will Flash 3 Times, Indicating Successful Pairing Interlock Mode: When The Controller Is Powered On, Hold Down The Learning Button And Wait For 5 Seconds. The Indicator Light Flashes Twice In A Row. Release Your Hand, Press The Power Button On The Remote Control, And The Indicator Light Flashes Three Times Before Turning On. Then Press The Key On The Remote Control, And The Indicator Light Flashes Twice, Indicating Successful Code Pairing: Code Clearing: Connect The Controller To The Power Supply, Hold Down The Learning Button And Wait For 8 Seconds. The Indicator Light Flashes Continuously 4 Times To Indicate Successful Code Clearing Manual Switch: The Learning Button On The Controller Can Control The Output To Turn On And Off. Press It Once To Turn It On, And Press It Again To Turn It Off Working Modes: Interlock: Press Each Key On The Remote Control With Your Hand To Turn On The Corresponding Relay, And Then Press Another Remote Control Key; The Corresponding Relay Is Connected, The Other Is Disconnected, And Only One Relay Can Be Connected At A Time. Self Locking: The Same Key Controls One Channel, Press It Once To Turn On, Press It Again To Turn Off, And Two Channels Are Independently Controlled,  Package Includes: 2 X Remote Controls 1 X Receiver 1 X Antenna