SBUS-2, T-FHSS protocol, telemetry ready. For EP Car Models T-FHSS SIZE: 35.1 mm x 23.2 mm x 12.5 mm WEIGHT: 7.0 g RATED VOLTAGE: DC 4.8V-7.4V OPERATING VOLTAGE: DC 4.0V-8.4V NEVER USE THE R304SB-E IN NITRO CARS