KO Propo EX-NEXT Master Unit Upgrade Set. This optional set is intended for those who already have a "Kustomize it Yourself" (KIY) CONCEPT radio, you can upgrade to the latest EX-NEXT by replacing it with this master unit. Important Notes:Can not use FHSS or DSSS receiver. (KR-418FH KR-415FHD,KR-210S etc)Can not use LCD Xpansion unit EXP-104 series..Features: Antennaless, lightweight, compact Master unit. Equipped with "XT" that achieves the fastest communication speed in the industry. XT Advanced Mode XT Telemetry mode Specifications: Power supply: AAA Ni-MH battery x4 (sold separately), Li-Fe battery 2cell 6.6V (sold separately), Li-Po battery 2cell 7.4V (sold separately) Current: 200mA or less Channel: PWM 4ch/ Serial 8ID Frequency: 2.4GHz Radio Mode: XT Model memory: 50