This product is a high-quality battery designed specifically for Samsung Galaxy A20, A30, and A50 models, with a capacity of 4000mAh. As a UK seller with a manufacturer warranty of 3 months, you can trust in the reliability and longevity of this internal battery. The voltage of 4.40V ensures compatibility and efficient power delivery to your device. With a wired connection through the phone antenna port, this battery is a convenient and essential accessory for keeping your phone powered up and ready to use.