This is the Dynamite Rechargeable Battery Conversion Set for Hitec, Futaba, Airtronics, and KO Transmitters.  Modelers who use alkaline batteries in their R/C transmitters know how expensive a fresh set of eight good batteries can be. Over time, that recurring cost can turn into something fairly substantial. Now there's a way around that expense, with Dynamite's Transmitter NiCd Conversion. Designed to convert any transmitter (does not include JR or Spektrum - for JR/Spektrum conversion, search for DYN1900) that utilizes "AA" dry cells and has a built-in charge jack to convenient rechargeable nicads, this new conversion kit features genuine Sanyo® 600 mAh cells for reliability and power. A 300mA AC wall charger is included, and can complete a charge in around two hours. This universal version is for Airtronics®, Hitec®, Futaba®, and KO® transmitters. The universal version is also compatible with Tamiya® QD cars and trucks. If you're tired of buying new batteries for your radio system all the time, look into the Dynamite NiCad conversion. Fresh power is just a charge away!