1. Make sure the voltage of the power supply matches the voltage range of this instrument described in the manual (Please note that the battery or adapter and power cord with original specifications must be used to prevent overpressure from burning the instrument). 2. Power cord: Type-C power connection cable, and DC5V adapter. 3. Do not put or operate in wet/damp conditions. 4. Please operate the instrument only according to the manual 5. Please use the supplied or recommended accessories. 6. Do not use the instrument once it works abnormally or is damaged. 7. Do not operate the instrument near the heat source. 8. Avoid sundries and dust into the transmit channel. Keep the transmit channel away from soft cloth, hair, and fluff. 9. The instrument shall not be squeezed by other objects during the testing. 10. Do not drop or put anything into the opening or joint of the instrument unless specified stated in the manual. 11. Keep the instrument away from a strong electromagnetic field interference source. 12. Avoid direct sunlight. 13. Working environment temperature: +5℃～ +40℃ , relative humidity: 15% ～ 80%. 14. Remove the battery when the instrument is not in use for a long time. 15. Power supply requirement: 3V-CR2 lithium battery, USB power adapter (5V/1A).