Overview of advantages of Hagen Exo Terra LED Hygrometer Precise indication of relative air humidity Remote sensor Control at the touch of one button Minimum/maximum memory Batteries included Size L 4.6 x W 1.8 x H 4 cm Battery Directive Information Batteries are included in the delivery of many appliances that help e.g. to work the appliance with a remote control. Batteries can also be built in to appliances. As regards the sale of these batteries we as manufacturers of said batteries are obligated to inform our customers of the following Batteries should not be disposed of along with normal household waste. Please dispose of old batteries as stated by governmental legislatures either in a communal collection point or return them free of charge to place of purchase. Batteries bought from us can be returned after use to the address below free of charge or simply send them back to us in a stamped envelope. zooplus AG Versandzentrum Vor der Hecke 4 34355 Staufenberg Batteries containing contaminants are labeled with the symbol of a rubbish bin with a line through it & are recognized by the chemical symbol for the rating of crucial contaminating heavy metals. Cd stands for cadmium PB for lead & HG for magnesium.