GFCI 20Amp Tamper Resistant - Self Test (UL943) White
20Amp - 120V AC
Tamper Resistant
Weather Resistant
UL 943 New Standard - Compliant
Auto-Monitoring or Self-Test Function
Reverse Line-Load Misfire Function -repeated
Detecting Ground Fault and Interrupting Circuit 
Additional Features:
Corrosion Resistance
Ground Circuit
Passed Drop and Impact Test
 the reset button will not engage if protection has been compromised
When miswired, GFCI (Ground Fault Circuit Interupter) outlets have no power, so it is more safe than conventional receptacle
If miswired or if GFCI protection is damaged, GFCI can't be reset
Easier installation