Player One
This DC adapter - 5.5 x 2.1 mm to 2.5 mm, is designed to convert a 5.5 x 2.1 mm DC power jack to fit a 5.5 x 2.5 mm socket. Astro gear commonly uses the 5.5 x 2.1 mm standard, so this would allow you to connect to a 2.5 mm socket using existing power supplies and cables.
Female socket: 5.5 x 2.1 mm
Male plug: 5.5 x 2.5 mm
Ideal for powering the AstroGear Controller from other DC sources