The SD-1 Sound Devices Hirose DC Input Sled from Hawk-Woods features a 1x HRS 4-pin DC input connector for the Sound Devices MixPre-3 and MixPre-6 audio recorder/mixer interface. The adapter slots onto the rear of the mixer just like the Sound Devices original battery sled. It clicks into place to ensure a secure connection, and can be used to power the mixers from an external powering device. The input range is 10 to 20V input.