The TP5400 is a dedicated power bank charger for single-cell lithium-ion batteries and a constant 5V boost controller. The charging section integrates high-precision voltage and current regulators, pre-charge functionality, charging status indication, and charging cutoff, and can output a maximum charging current of 1A. The boost circuit utilizes a VFM switching DC/DC boost converter manufactured using CMOS technology, exhibiting extremely low no-load current. It features very low no-load power consumption (less than 10µA) and a boost output drive current capability of up to 1A. No external buttons are required; it is plug-and-play. Input Section: * MICRO USB charging input: 5V (charging input voltage range: 5-9V) * Maximum charging current: 0.99A * Rechargeable battery: 3.7V single lithium-ion battery * Charging voltage: 4.2V Output Section: * Output voltage: 5V (uncharged) Note: When charging and discharging simultaneously, the output voltage = input voltage - 0.4V * Output current: 1A Color: As Shown Material: plastic Package Contents: 1*module 1*cable 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.