Heavy-Duty Accessory/Dual USB Sockets and 12/24V DC LED Volt Meter. Easy to read L.E.D Volt meter displays accurate battery voltage for reference. Features dustproof accessory and USB socket covers and heavy-duty construction. Amp rating: Accessory Socket 20A at 12V, 10A at 24V USB Output 5V, 2.5A Volt Meter Range: 6–33V DC