* Low Temperature, safe & Durable. 
* Low Power, Environmental Protection. 
* Special photoelectricity control,three steps current application. 
* Long Life with 500000 Operations. 
* MOV Provides Reverse Current Protection. 
* Superior Strength Aluminium Alloy,Solid Stain-less Steel Bolt. 
* Double protection for loading current. 
* Auto-relock if no Action within 5 secs. 
* Certificate:CE&MA 
* Photoelectricity Control,Low Temperature,