Specification: Origin: Mainland China Type: Module Condition: New Product size: 24.00x20.00x4.00mm Product size: 0.94x0.79x0.16inch 1. This link module is protected, and the battery can be used with or without protection. You do not need to worry about the T point. Just ignore these. 2. Attention! Notice! Customers who do not have a multimeter should not purchase this product. Do not ask for advice on how to adjust the voltage if you do not have a multimeter. The factory voltage is random. Product features and parameters 1. Up to 1A programmable linear charging current 2. For single cell 3.7V lithium battery, fully charged 4.2V 3. Constant current/constant voltage charging with over-temperature protection 4. Soft start limits surge current, with battery reverse connection protection 5. Low power consumption standby to extend battery life 6. Dual output of charging status, no battery and fault status display 7. Can be activated at 0V and trickle charged at 2.9V 8. Working temperature -40~80℃ 9. Input voltage range 4.2V~6.5V 10.Output voltage 4.2V-28V adjustable 11.Maximum power 5W Charging indicator light description The module can roughly judge the working status of the module through the two LED lights and other status. CHRG It's red, stdby is blue. When the battery is charging, the red light is highlighted and the blue light is on. Not on, but the red light is slightly brighter. If there is a boost output Depending on the output power, the red light may be highlighted during charging but not connected. When there is no load, the blue light is on and the red light is dimly on. Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x Charge Boost Discharge Adjustable Module 1. Ultra-thin and Ultra-mini Design: With its super slim and compact design, this charge boost discharge adjustable module stands out for its exceptional chip quality control. It also features adjustable boost output voltage, allowing you to customize the output according to your needs. 2. Optional Battery Protection: Choose whether to include battery protection. With a programmable linear charging current of up to 1A, charging boost discharge integrated module ensures efficient and safe charging while extending battery life. 3. Multiple Protection Mechanisms: This charge discharge integrated module is equipped with multiple built-in protection mechanisms such as overvoltage protection, overcurrent protection, and short-circuit protection, ensuring the safety of both the module and connected devices. 4. Adjustable Parameters: Enjoy flexibility with adjustable parameters. This charge discharge integrated step up module typically offers adjustable output voltage and output current, empowering you to tailor the settings to meet specific requirements. 5. Integrated Design: Designed for convenience, this li-ion battery charger module integrates the functions of boosting and discharging into a single unit. The seamless integration simplifies wiring and installation processes, saving you time and effort.