Feature: 1. The working voltage is AC160~277V, and the wide working frequency is 20~100Hz, which can ensure that the engine can still be charged at low speed (idling speed). Users can directly replace the body charger or charge the mains 2. Suitable for charging acid batteries, especially for fully-sealed solid wide-temperature batteries 3. Automatically identify the voltage level of the charged battery pack, and then automatically charge according to the battery voltage level 4. Used in a humid environment where the working temperature is -40℃~+50℃ and the relative humidity is 98%RH without condensation 5. Made of good‑quality aluminum alloy material, light weight, possess good strength and good corrosion resistance Specification: Item Type: Generator Intelligent Battery Charger Material: Aluminum alloy Model: CH2804 Working Frequency: 20~100Hz Output Current: 4A Working Temperature: -40℃ ~ +50℃. Package List: 1 x Generator Intelligent Battery Charger1 x User Manual Note: 1. For people safety, the grounding wire of this machine should be reliably grounded.2. Although the machine has been treated with moisture and corrosion protection, please pay attention to avoid working in wet and corrosive places when using.3. The charger is in a continuous working state, and there must be a certain space for heat dissipation and ventilation during use.4. The components in the charger have been adjusted and set accurately, please do not adjust easily.