LD7901B is a 79GHz millimeter wave high frequency band radar sensor module. The working principle is to use FMCW FM continuous wave to convert water level into electric signal, which can realize effective water level measurement. The product is mainly used for water level measurement in hydrological monitoring, urban pipe network and fire fighting water tank. Support UART output plug-and-play can be flexibly applied to different intelligent scenarios. Frequency:79GHz - 81GHz Modulation mode:FMCW Detection distance:0.15m - 15m Transmit power:12dBm Horizontal/vertical range:8/7 EIRP parameter:19dBm Distance measurement accuracy:1mm (theoretical value) Sampling update rate:10Hz(configurable) Average power consumption:0.011W (related to the sampling period) Ambient temperature:-20 - +80 Power supply range:33V Type:With Cable Colour:Green Material:PC+Metal Package Contents: 1 * Sensor Module 1 * cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.