Sharp EL-506H

Alkaline manganese battery (Type: LR-44) x 2 or silver oxide battery
(Type: G13) x 2 (Eveready model S76, Mai lory model MS76 and
Ray-O-Vac model RS76 or equivalent should be used.)
Batteries may be obtained where you purchased your calculator or at
most retail outlets for calculators, watches, or cameras.