Limited EditionSkull & CrossBones Great Little Yellow Speaker with Black Steel Mesh Grill and volume control thumb wheel, no battery needed just screw it on to your existing CD V-700 phone jack and enjoy the sweet clicks of ionized neon quench gas from your Geiger tube. plus you can turn the volume down by a simple swipe of your finger across the volume control thumb wheel.....It has a pronounced audible click using  a tuned speaker chamber to give maximum audible output clicks. CNC Machined and painted to match the CDV-700.Designed and constructed in USA. Online future website coming soon.See all my other speaker designs Click on (See other items) on right side of add....You may return the Great Little Yellow Speaker for any reason if not satisfied for a complete refund. What you will get....1- Great Little Yellow Skull Speaker1- Installation Manual