This is the Dynamite Rechargeable Battery Conversion for JR and Spektrum surface 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 JR or Spektrum surface transmitter that utilizes "AA" dry cells and has a built-in charge jack to convenient rechargeable nicads, this new conversion kit features genuine SanyoŽ 600 mAh cells for reliability and power. A 300mA AC wall charger is included, and can complete a charge in around two hours. 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!