SPD-HR21 Hirose to 2.1mm DC Barrel Jack Cable Flexible Connectivity for Professional Audio Gear The SPD-HR21 is a practical power solution for connecting Hirose-compatible power distribution systems to devices using a standard 2.1mm DC barrel jack. Designed with a 4-pin Push-Power connector (fully compatible with Hirose 4-pin ports) on one end and a 2.1mm DC jack on the other, this cable offers a simple and efficient way to power essential gear on set or in the studio. Ideal for popular receivers such as the Lectrosonics UCR411, UCR401, UCR211, and UCR201, the SPD-HR21 also supports a wide range of other 2.1mm DC barrel devices. However, it's important to note that this cable is unregulated and passes through 9-18V directly from the power distro. It should not be used with equipment requiring a strictly regulated DC input. For professionals who need flexible, field-ready power options, the SPD-HR21 provides a lightweight and dependable connection.