My Dual Parabolic SAR EA

I have made a new ea i would like to share , its a dual parabolic sar one is used as a trend indicator and the other trades on the cross of the psar.
the trick is it only trades when the new cross occurs with an engulfing bar. any thoughts . cheers

update here is the mt4 source file , i could not get the ex4 file to load, bit this will work ,