12V 500mA Adapter

The AC adapter, AC/DC adapter or AC/DC converter is a type of external power supply, often enclosed in what looks like an over-sized AC plug. Other names include plug pack, plug-in adapter, adapter block, domestic mains adapter, line power adapter, or power adapter. Informal terms include wall wart, wall cube and power brick. AC adapters are used with electrical devices that require power but do not contain internal components to derive the required voltage and power from mains power. The internal circuitry of an external power supply is very similar to the design that would be used for a built-in or internal supply.
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External power supplies are used both with equipment with no other source of power, and with battery-powered equipment, where the supply both charges the battery and powers the equipment when plugged in.
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Use of an external, rather than internal, power supply allows battery-powered equipment to be used portably without the added dead weight and bulk of internal power components, and makes it unnecessary to produce equipment for use with a specified power source.

EI48 series UL Adapter
lnput: 110V AG, 50Hz, Class ll
Output: 3-24V DC,500-4000mA,