... with external telescopic antenna!Transmitter:Model No.: C-2Channel: 2 CHRemote Control Distance: 100m / 300ft (theoretically)Encode: ... Normally Closed; B, C = Normally Open.1) Press button 1: Turn on relay 1 (connect B and C, ... , connect A and B)3) Press button 2: Turn on relay 2 (connect B and C, disconnect A ... and B)4) Press button 2 again: Turn off relay 2 (disconnect B and C, connect A ...