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TW-283 is a type of multi-functional shutter remote control
Refer to "+" / "-"within the transmitter's and receiver's battery compartments to insert the batteries. The receiver flash as red LED light;If the light doesn't flash,it should be the battery reversed the direction.
I have an RX10 and 2 different RX100's. This Shutter remote works great on all of them. I am getting into astrophotography and anything with low light/long exposure is an enemy to vibration. I remote really comes in handy. I used to use Sony's app on my phone for this but it is so unreliable. This remote release is much more dependable.
I been looking for a remote shutter for my a7riii and gave this product a try. I was able to use it as wires and wire which was great. Using the remote shutter I was able to take great nightsky shoot without any issue. So far all the functions seems to work fine without any issue. Overall its a great product.