Features: This TP5400 module efficiently charges single cell lithium batteries with high conversion efficiency up to 95%, featuring built in overcharge and over discharge protections for enhanced safety and extended battery life. It supports input voltages ranges of 3.0V to 4.5V and boosts output to 5V or other levels, all in a compact design ideal for space limited applications. Ideal for electronics hobbyists, enthusiasts, and engineers developing portable devices that require reliability power management solution. Perfect for use in projects like powerbanks, handheld gadgets, and small electronics where efficient boosting conversion and battery safety are essential. With its integrated protections mechanisms and high performances capabilities, this boosting converter ensures reliability operate and energy savings in various electronic setups. Specifications: Component: ABS Size:Approx.45x20mm/1.77x0.78inch charging input: 5V (charging input voltages ranges: 5-9V) most charging current: 0.99A Rechargeable battery: 3.7V single cell battery Charging voltages: 4.2V (output part) Output voltages: 5V (uncharged) Option Type:1pc,2pcs,3pcs; Note: When charging and discharging at the same time, the output voltages = input voltages - 0.4V. Output current: 1A Package Includes: Package A 1pc Battery Charging Module Package B 2pc Battery Charging Module Package C 3pc Battery Charging Module note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.