Power supply: DC power supply 5V or 3 No.5 batteries
Operating voltage: 5V
Working current: greater than 30mA
PCB length: 72*62mm pure manual measurement, there is 1~2mm error
Measuring range: 0.01~4.00 meters when the distance is less than the alarm distance, the alarm sound is issued
Key setting: Short press the Set key, digital tube display alarm distance. Adjust the distance by pressing “+” or “-“, then press Set to save and exit

Attentions
1. All products (except those specially marked) are loose parts, and the buyers need to solder, assemble and debug by themselves. If you need finished products, you can contact customer service to buy them.
2. If there is a problem with the product you received, or there is a problem during the soldering and assembly process, please contact us as soon as possible.
3. Do not including battery