Specification: <1>Battery Type: 2 AA batteries, 2x 1.5V AA batteries <2>Battery Holder Switch Function: AA battery holder with ON/OFF switch <3>Battery Holder Wire Leads: 2 aa battery holder with black and red wire and wire leads, with tinned wire end <4>Battery Holder Wire Length: 5.7"/14.5cm <5>Cable Diameter(count in the PVC isolation around the wire): 0.0393"/1mm <6>Battery Holder Cable Color: red and black <7>Battery Case Dimensions: 2.708" x 1.34" x 0.75"/6.88cm x 3.4cm x 1.9cm(L*W*H) <8>Battery Box Weight: 0.67oz/19g(one battery holder with one screw weight) <9>Battery Box Color: black <10>Material: Plastic ABS <11>Screw Size: 0.303" x 0.0787"/7.7mm x 2mm(Length*Diameter) Package Contents: 20x 2 aa battery holder with switch leads 20x screws