- Mains regulation 174-264 volts - Mains Spike Protection (SMP) - Over Voltage Protection (EVS) - Mains Filter (LIFT) - USB charger - Voltage and Voltmeter - 6 Amps capacity - Mains outputs: 11 outputs of two isolated banks. Furman has been one of the most trusted manufacturers of AC/Mains Filters, Voltage Regulators, Isolating Transformers and Switch-on Sequencers for over 35 years. Furman's products provide today's modern electrical equipment with the protection that is all too often lacking.