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The SPD-HR21 is a 4-pin push-power (compatible with Hirose 4-pin) to 2.1mm DC barrel jack. Is is meant to be used with Hirose-compatible power distros to 2.1mm DC barrel jack devices.
While it can work with any 2.1mm DC barrel jack device, note that this cable is unregulated and will output 9~18V. Do not use with 2.1mm DC input devices that require regulated voltage.
suitable for use with:
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