Ningbo Prosound Hi-Fi Capacitor Co. Ltd. (China) released its PSC-5504 power capacitors, which feature a capacitance of 2 F and come with a polarity protection circuit. Rated at 20 Vdc to 24 Vdc, the devices have an ESR of 2 milliohms and operate to temperatures up to 95 °C. The capacitors are available with digital displays.