QUIET AND WATER RESISTANT SEALED, THIS AERATOR IS PROVEN TO PERFORM DAY IN AND DAY OUT. COMES WITH 2 SETS OF AIR STONES AND AIR LINE TUBING. A TWO SPEED SETTING SWITCH CONTROLS THE PISTON PUMP FOR A "HIGH" SETTING FOR MAXIMUM AERATION, WHILE THE "LOW" SETTING CONSERVES BATTERY LIFE. . SEE ITEM NUMBER (IBD) TO ORDER BATTERIES