Its locking system is superior to the standard non-lockable MAIN connector Currect/Voltage: 20A/250V Color:Power-in(NAC3FCA-1, Blue) / Power-out(NAC3FCB-1, Grey White) Lockable 20A/250V AC device coupler Linear, uncharged and pre-grounded three contacts Power input (blue) and power output (Grey White) have different lock keys to avoid short circuit Fast and convenient rotary locking system Ergonomic design Colour:Gray-white+blue Material:plastic Package Contents: 10 x PowerCon socket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.