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The Hydra240 use FETS that offer 50% less resistance than those used in the older models – that means a cooler controllers at unbelievable power levels. Castle has also added water-cooling heat sinks to take these controllers to even more incredible power levels. 5-20 NiCad/NiMh cell or 6S LiPo with an amazing 240 amp rating! This unit is also water resistant. Hydra 240 is a beast. The Castle Creations engineers put twice the cables on this monster in order to handle Two Hundred and Forty amps! Specs: Programmable with the transmitter or optional Castle Link computer adapter. Continuous Maximum Current: 240A Dimensions (WxLxH): 1”x 3”x 1.6” (25.4mm x 76.5mm x 40mm) Weight: 6.2 oz. (178 grams) Full On Resistance: .00022 ohms Wire Gauge: 10 Cells w/BEC: 5-12 NiCad/NiMh, 3S LiPo Cells w/o BEC: 5-20 NiCad/NiMh, 6S LiPo Recommended ESC for use with upto 4s lipo boats that draw between 0 to 160 amps continous.