Environmental sensors are high quality instruments preferred by scientific research, teaching, laboratories, soil and fertilizer stations of agricultural departments, agricultural science institutes and related agricultural environmental monitoring departments.

Unmanned aircraft (UAV), abbreviated as "UAV", is an unmanned aircraft operated by radio-controlled equipment and its own programmed control device, or operated autonomously by on-board computers either completely or intermittently.

Wireless earphones are the middle lines replaced by radio waves, connected from the computer's audio outlet to the transmitter, and then sent by the transmitter to the receiver, the receiver is equivalent to a radio.