As low as $0.00
Requires a 12VDC Power Supply. If you are powering from another device (such as a PicoBoo) then you will not require one.
The wireless unit is user configurable for momentary, latching, and signal interlock.
The wireless triggers work the farthest when there are no obstructions. But they do work through walls and such, just not as far.
These are not waterproof and must be protected from all moisture.
They use the same frequency (315Mhz) and they will conflict with each other as they each use the same communication protocol.
The battery is a “23A” and is replaceable.