Fangrui Product Details Number Of Channels: 1/4 Battery: 12v 23a Installation: Wireless Wireless Mission Distance: 50-150 (m). (open Space) Frequency:dickert Mahs40 40.685mhz Red Buttons. Only Compatible With For Dickert Mahs40 40.685mhz For Dickert Mahs40-01 / For Dickert Mahs40-04 Purchase Tips: Check The Frequency On The Back Of The Remote Control, It Must Be 40.685mhz. Check The Colour Of The Button, Which Is Red. Check The Model Number Of The Remote Control, Which Is Mahs40-01 / Mahs40-04. Programming Manual The Mitter And Receiver Understand Each Other, The Code Must Be Set As Follows. Remove The Battery Cover By Sliding It In The Direction Of The Keyring Tab. Set The Dip Switch Up/down Same As Your Used Remote Control Or The Receiver. Note: Installation Guide Not Included, We Strongly Recommend You Seek Professional Installation. Please Check As Much As Possible To Make Sure The Item Is What You Need. Tips: The Product May Be Updated Constantly ,due To Different Batches, The Actual Product May Have Slight Differences O