The h2o power lcd thermometer waterboy operates on ordinary tap water using the latest h2o technology to provide the display of energy. fill the tub with water to the indicated level to activate the display and place the waterboy against the two magnetic electrical connection points. a tub filled with water produces enough electricity for about 2 weeks. the temperature is set in °c or °f degrees and is displayed at the head of the waterboy. add water when the lcd display begins to fade. if the lcd display weakens and does not respond to fresh water, the electrodes can be cleaned with ordinary vinegar!the Lcd thermomter waterboy is an original eco gadgets, no batteries or chargers are needed, only water and can be used anywhere.features- energy saving- uses ordinary tap water- equipped with the latest technology h2o- easy to clean- temperature in °c and °f degrees selectable- super original eco gadget- including multi-language instructionsproduct information- product: powerplus h2o power - lcd thermometer waterboy - energy saving - water powered- material: plastic- dimensions: l 12 x w 11 x h 9 cm- weight: 124 grams- colour: blue, white- packaging: gift packaging- packaging dimensions: l 14.7 x w 11.7 x h 11.5 cm - packaging weight: 197 grams- brand: powerplus