The OKY3399-8 is an electronic module manufactured by OKYSTAR that contains an integrated Li-Po/Li-Ion charger with TP5000, a 1A output, and a 4.2V output voltage. This module is designed to recharge and maintain a range of Li-Po/Li-Ion batteries, including those used in mobile phones, digital cameras, and other portable electronics. It is a compact and reliable solution for powering up your devices while on the go. This module is also suitable for use in a wide range of applications, including car audio systems, data centers, medical devices, and more. The module includes a wide range of protection features, including over-voltage protection, over-temperature protection, and over-discharge protection.