A sealed 12V rechargeable battery pack for the Maycom AH27, Midland 42, and RadioShack handhelds.
Because this pack is a full 12V, it allows your radio to give a full 4W output. If you used nicads in the normal empty battery case, you will only have 9.6V (8 x 1.2v) and consequently the output from your radio will be lower.