... : 56mm x 32mm x 12mm Power Supply: 2 x 3V button cell batteries (Included, can be used for 12 months)Usage:Initial ... : A, B = Normally Closed; B, C = Normally Open.1) Press button: Turn on relay (connect B and C, disconnect A and ... B)2) Press button again: Turn off relay (disconnect B and C, connect A ...