Input voltage: AC 220V Output voltage: AC 18V*2 power 50W, used for preamplifier/2.1 power amplifier/tone board, headphone amplifier board/karaoke board, etc The normal operating temperature of the transformer is -45-+105℃; the ambient air temperature is -30℃~+40℃, and the average value over 24 hours does not exceed +35℃; when it exceeds +40℃, the negative capacity of the transformer decreases; when it is lower than 0℃ When the temperature is below C, the load capacity of the transformer increases, and the load function may slightly exceed the rated power. In a low temperature environment of -30°C, the normal starting and normal operation of the transformer will not be affected. Good low temperature characteristics are the advantages of the transformer It is recommended that the maximum ambient air humidity should not exceed 90%, and the monthly average humidity should not exceed 75%. In an environment with high humidity, it is recommended to use a waterproof transformer. The waterproof transformer has a protection level of IP68 and can still work for a long time even if it is immersed in water. There is currently no requirement for the altitude of the installation site for the transformer Note:The output thread color from batch to batch, please refer to the actual product Colour:As Shown Material:Metal Package Contents: 1 Transformer 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. High temperature lead wire, temperature and flame retardant, low line resistance High-quality steel bracket, reliable fixation and low vibration High quality magnetic core, high magnetic permeability and low coercivity Thermal shielding layer not only reduces interference but also facilitates heat dissipation Pure copper enameled wire, sufficient supply of large current and stable voltage