Came with 2 AAA batteries already installed and they were dead. One of them was filled with acid. I put in two new batteries and was able to turn on the device. Big problem: The instructions don't make sense and are clearly written by someone who doesn't speak English. For example, "Operation Description Power on/off" is: Press the power button for more than 1 second. A bee buzzed, the screen lit up. When turning on the power, the power button was pressed and the bee rotated to turn off" and "When the power is open, the low sensitivity test status is set to the default setting." The whole guide is like this. Generally unsatisfactory Pretty useless I'll have to figure it out myself without bees.
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