PS220ULI is a USB 48V phantom power supply that powered by 3.7V lithium. It charged by PC USB connector, phone charger and bank charger. Its diversity power supply makes PS220ULI easy to use. The pro circuit design can effectively filter the interference of AC signal and shield the interference noise of external audio equipment. PS220ULI offers purity and stable phantom power to condenser mic (or other devices need 48V phantom power). Its built-in sensitivity and low cut switches reduce environment noise collective and low frequency noise.