... Applicable to control of no fan (WH501WW), single-speed fan(WH502WW)and three-speed fan(WH504WW).10) Fan speed adjustable automatically or manually( ... in standard box(WH501 WW,WH502WW,WH504WW), or allowed to install on battery seat for wireless transmitting(WH501RF,WH501MRF). 17) ... /250V (WH501WW, WH502WW, and WH504WW); 16A/250V (WH501RF); 5 A/250V (WH501MRF)Probe sensor: NTC (100K) 1%Service life of ...