- 2~6 commands (Pocket size transmitter : F21-2S/D) - Low cost for electronic chain hoist/monorail - Low power consumption transmitter. 2 AA batteries last up to 4 months - Extra shock resistant relay specially for mobile devices (DC model only) - Over 4.3 billions unique ID code available. - Temperature range -35°C ~ +85°C - Enclosure protection class IP 65 - Microsoft Windows based software for easy customize configuration - Structure : Glass-Fiber