Specification:
Type of AA Battery Holder: 4 types of aa battery holder with switch and cover selling together: single aa battery holder, 2 aa battery holder, 3 aa battery holder, 4 aa battery holder
Voltage Output of AA Battery Holder with Cover: 1x 1.5v aa battery= 1.5v aa battery holder, 2x 1.5v aa battery= 3v aa battery holder, 3x 1.5v aa battery= 4.5v aa battery holder, 4x 1.5v aa battery= 6v aa battery holder (Note: Batteries are not included in the package)
Switch Function: ON/OFF switch on the back of aa battery holder with cover
Dimensions of AA Battery Holder with Wires(L*W*H): (single aa battery holder with switch: 2.70" x 1.02" x 0.72"); (2 aa battery holder with cover, 2.708" x 1.34" x 0.708"); (3 aa battery holder switch, 2.69" x 1.91" x0.73"); (4 aa battery pack with switch, 2.677" x 2.535" x 0.760")
Wire Leads of AA Battery Holder with On/Off Switch: aa battery holder with leads, tinned wire end
Wire Length of AA Battery Holder with Leads and Switch: 5.709 inch/14.5cm
Wire Diameter(count in the PVC isolation around the wire): 0.0393"/1mm
Wire Color of Battery Holders for AA: red(positive output) and black(negative output)
Weight of One AA Battery Holder with Switch: (1 aa battery holder, 0.494.oz/14g);(2 aa battery holder, 0.564oz/16g;);(3 aa battery holder, 0.917.oz/26g);(4 aa battery holder, 1.27oz/36g)
Screw Size(Length*Diameter): 0.303" x 0.0787"/7.7mm x 2.0mm size for single aa battery holder and 3aa battery holder and 4aa battery holder; 0.303" x 0.0669"/7.7mm x 1.7mm size for 2 aa battery holder

Package Contents:
1x 1 aa battery holder
1x 2 aa battery holder
1x 3 aa battery holder
1x 4 aa battery holder
4x screws for aa battery holder with switch