BUTTON diameter-6mm, length-19mm   AIWA AD-M600. Used.

1 unit. It can also be used for other models:  AD-M700 AD-F60M AD-F66M 

BUTTON diameter-6mm, length-19mm   AIWA AD-M600. Used. 1 unit. It can also be used for other models:  AD-M700 AD-F60M AD-F66M