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