A radio remote control grab allows the operator to control the grab bucket's movements wirelessly using a handheld transmitter or controller. The transmitter sends signals, usually through radio waves, to the receiver unit installed on the grab bucket. The receiver interprets these signals and activates the necessary mechanisms to open, close, lift, or release the grab bucket accordingly.
link:https://www.kinocranes.sg/grab-bucket/radio-remote-control-grab.html