The EK 2000 from Sennheiser is a battery-powered wireless receiver. It's designed to receive wireless audio signals from the SK 2000 beltpack transmitter, the SKP 2000 plug-on transmitter, as well as being backward compatible with all Evolution, 3000, and 5000 Series wireless systems. You can scan for available frequencies with the EK 2000 and synchronize the found frequency with infrared technology to a 2000 Series transmitter.
While the EK 2000 may visually resemble the Sennheiser Evolution EK 100, closer inspection reveals that the 2000 Series offers a lot more power and versatility. The EK 2000 is a diversity system that cleverly uses the output cable of the receiver as a second antenna (diversity systems can really help you avoid drop outs and interference). A headphone output is included that enables you to monitor your signal, as well as have the EK 2000 double as an IFB or remote listening device.
Charging contacts on the sides of the EK 2000 receiver enable you to utilize the L 2015 charger and BA2015 rechargeable batteries (sold separately). The EK 2000 is a really powerful receiver for use on a video camera, in a field audio kit, or for any situation where you need to wirelessly receive audio in an ultra-compact component.