Description Thin Speaker - 0.5W Offers a 8 Ohm speaker Diameter: 40 mm Thickness: 4 mm The Thin Speaker - 0.5W is only 40 mm in diameter and just over 4 mm thick, the same kind you might find in one of those "talking greeting cards". View more What's Included 1 x Thin Speaker - 0.5W Dimensions Size Thickness: 4 mm External diameter: 40 mm Links PDF File Specifications Watts: 0.5 Speaker: 8 Ohm