This is Sennheiser's plug-in power supply (article 509454) for the Evolution Wireless Digital (EW-D / EW-DX) family, listed by Sennheiser as the EW-D Power Supply. It delivers 12 V DC at 1 A to power stationary equipment such as Evolution Wireless Digital receivers and related accessories from a mains socket. Sennheiser's product image shows it supplied with interchangeable country plug adapters, which is useful for touring engineers and rental companies whose kits travel between countries. Typical users are sound engineers, churches, schools, conference venues and event companies who need a spare or replacement supply for a receiver, or an extra unit to keep in the road case. A like-for-like manufacturer supply avoids the risk of wrong polarity or insufficient current that comes with generic adapters. It is covered by Sennheiser's two-year warranty. Check the required input on your specific receiver or accessory before ordering; larger multi-channel devices and charging stations may use a different supply.