The surface of the generator is clean, no corrosion, and the structure is firm. Axial spacing: 0.2 - 1.0mm Mechanical noise: 55dB Features: Without a voltage regulator, the output voltage is proportional to the water pressure. Note: There are two types of lithium batteries on the market with a charge control chip and without a charge control chip. Charging requires a charging control chip, otherwise it is easy to explode. Colour: Black Note:1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding 2. Color may vary by monitor. Please understand that Note: Hello, please pay attention to your delivery address when purchasing the product. If your pickup information (e.g. name, street, house number, doorbell/email with no name) is incorrect, the order will not be delivered correctly. )