Winland Electronics W-S-U Enviroalert Water Presence Standard Surface Sensor; Unsupervised. Description Winland Electronics W-S-U Enviroalert Water Presence Standard Surface Sensor; Unsupervised For use with models WB200 and WB350. Winland Electronics brand products. W-S-U series product. Made in United States. BrandWinland Electronics Power SourceBattery Powered Item Dimensions LxWxH3 x 2 x 0.88 inches Control MethodApp For use with models WB200 and WB350. Winland Electronics brand products. W-S-U series product. Made in United States.