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One person found this helpful
Works - no instructions - bit fiddly
on 21 July 2012
I don't normally review things but just thought I'd add that this does definitely work with the 3100. There are four tiny switches on the back of each part - I assume they are the channel it is using. They need to be set to the same channel - by default they are all off. Secondly, the cable in the picture isnt the same as the cable that comes - in the picture, the connector is a headphone type jack, but it comes with a USB input. I thought it didnt work but actually I hadnt connected it fully - you need to be quite firm.
Edit: battery has run out, not sure how to change it...