This is the newest and featured product by Wondlan. Its main features as bellow:
a. remote control: over 300M
(Source: Demo of Wondlan Wireless Follow Focus)
wondlan wireless follow focus test in vampires and huntress movie. Wondlan wireless follow focus helps the follow focus operator with the focus,and will not interfere with the track and movement of photographers. For a better experience watch it in HD and full screen.