Both receivers work on a different frequency from the one advertised. We were unable to connect the unit and make it work. 

The Sennheiser EK 100 G3 is a wireless microphone receiver designed for professional use. It features adaptive-diversity technology for excellent reception at all times and can be securely attached to a camera's shoe using a clamp mount. The receiver can synchronize to a G3 transmitter with a simple push of a button and is compatible with the optional DC 2 external adapter for extended use without batteries where a 12VDC source is available