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It looks like a battery checker. It dates from when nicad or NiMh batteries were used to power Rx's and servos. Simple to use plug into the Rx battery. Green LED's light, good to go, yellow LED's your pushing your luck. Red LED's lit do not fly, insufficent capacity left in battery. The more sophisicated checkers applied a load to the battery to hnopefully give a more realistic assessment of remaining charge.

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These battery checkers were mainly for checking the receiver pack, so typically 4.8v packs, though some slightly fancier ones were switchable between 4.8v and 6.0v packs, with a wee button to put the pack under a fixed load. 

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