Product size: light tube frame width 170* total height 225mm, white screen frame width 160* total height 185mmProduct weight: about 900gPrecautions1. The power supply of the experimenter is a 6V, 0.3A DC regulated power supply, or 4 AA batteries, please do not use other power supplies.2. When connecting the power supply, first turn off the light source switch, and turn the potentiometer counterclockwise to the end (maximum resistance)3. During the experiment, first turn on the stabilized power switch, and then turn on the light source switch on the experimenter; at the end of the experiment, first turn off the light source switch, and then turn off the stabilized power switch. During the experiment, if you need to turn off or light up the light-emitting diode, please operate the light source switch, do not operate the switch of the stabilized power supply.4. If none of the three light-emitting diodes light up during the experiment, check whether the positive and negative poles of the power supply wiring are connected incorrectly, whether the power supply has output voltage, and whether the power wiring plug is in good contact with the socket. If one of the diodes does not light up, check the contact between the diode and the tube socket, check whether the contact between the light source wiring and the socket is good, and check whether the diode is damaged.