A remote trigger that does what it should

Shutter half-pressed on the transmitter provides the autofocus on the camera focuses, with subsequent full Pressing the camera triggers. This is done depending on the set mode for a single image, a sequence of images, with time delay of 2 seconds or as long-term exposure.
The same happens with no transmitter on the receiver, but only in single-image mode.

Installing the system is easy: Turn on the camera is off plugging, camera, receiver on that trigger.

Advantages in my view:
+ Both devices (transmitter and receiver) "swallow" normal AAA batteries and rechargeable batteries that I have lying around to dozens. So I'm not dependent on specific (and usually quite expensive) "Watch Batteries".
+ The cable connects to the camera's removable, thereby the remote release (with the appropriate cable joint) at all times be operated on cameras from other manufacturers.
+ The fitting on the hot shoe is just one way, not a requirement. I always shoot with virtually plug-on flash and have therefore the remote release "dangle" always on the stand, but the function did not restrict.

Not tested:
- Maximum Coverage: I have no attempts à la "he creates really 100m distance" carried out is for my purposes also unnecessary. For a few fun photos I have already triggered by window and within the same apartment by several walls in 7m distance, all without dropouts. Therefore, I am firmly convinced that in the open up to 30m should not be a problem. More than 10m I go from my camera in the public sphere but also not gone ... ;-)

All in all I would give Pixel RW-221 buy at the features and the moderate price offered at any time and can it photo-amateurs, like me, only recommend. (Semi-) professionals have probably already very different claims, needs and budget.