A "wall wart" style variable DC power supply with its cover removed.  Simpler AC supplies have nothing inside the case except the transformer.Computer power supply
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Power Supply

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Motorola Vehicle Power Adapter micro-USB Rapid Rat $1.99 Western Digital WD Elements 2 TB USB 2.0 Desktop E $84.99
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Western Digital Caviar Green 2 TB SATA III Intelli $115.60 Western Digital 2 TB Caviar Green SATA II Intellip $67.97
Belkin Mini Surge Protector Dual USB Charger $8.99 Belkin 6-Outlet Home/Office Surge Protector $4.79
Western Digital Caviar Black 1 TB SATA III 7200 RP $59.99 Sennheiser RS120 926 MHz Wireless RF Headphones wi $49.00
Panasonic KX-TG6512B DECT 6.0 PLUS Expandable Digi $37.99 Logitech S120 2.0 Multimedia Speakers $6.95
P3 International P4400 Kill A Watt Electricity Usa Too low to display Amazon Kindle AU (Type I, Australia) Power Adapter $9.49
Western Digital WD Elements 1 TB USB 2.0 Desktop E $63.99 Plugable USB 2.0 10 Port Hub (with Power Adapter) $26.99
Apple Wireless Keyboard $42.99 Motorola SURFboard SB5101U DOCSIS 2.0 Cable Modem $34.90
OEM HTC USB Travel Charger Adapter U250 / CNR6300 $3.00 Ultra High Performance HDMI Switcher, 3to1 Switch $12.00
Kinect Sensor with Kinect Adventures! $61.91 Apple MagSafe 60W Power Adapter for MacBook MC461L $26.75
Apple MagSafe 60W Power Adapter for MacBook MA538L $24.50 Griffin Powerjolt Dual Universal USB Micro $15.00
Belkin BE112230-08 12-Outlet Home/Office Surge Pro $17.99 Belkin N150 Wireless N Router (Latest Generation) $24.99
Seagate Expansion 3 TB USB 3.0 Desktop External Ha $119.99 NEW Power AC Adapter/Charger for Apple MacBook 13. $28.90
Etón American Red Cross ARCFR160R Microlink Self- $28.45 Western Digital My Book Essential 3 TB USB 3.0/2.0 $122.99
Logitech S715i Rechargeable Speaker for iPod and i $83.50 Flip Video Power Adapter $4.49
Lite-On LightScribe 24X SATA DVD+/-RW Dual Layer D $19.95 Wireless LCD FM transmitter for ipod nano video cl $3.99
Kensington Car Audio AUX Cable for iPhone/iPod, in $2.75 Fellowes Shredder Oil, 12 oz. Bottle with Extensio $4.49
Laptop AC Adapter/Power Supply/Charger+US Power Co $11.99 SATA/PATA/IDE Drive to USB 2.0 Adapter Converter C $23.00
Motorola MH230R 23-Mile Range 22-Channel FRS/GMRS $34.99 Replacement 60W MagSafe Power Adapter for Apple Ma $27.95
Energizer A23 Battery, 12 Volt - 2 Pack $2.48 Airport Extreme 802.11N (5TH GEN) $129.99
Belkin Pivot-Plug Surge Protectors $26.70 Western Digital My Book Essential 2 TB USB 3.0/2.0 $84.99
Panasonic KX-TG6545B DECT 6.0 PLUS Expandable Digi $83.99 Honeywell RTH7600D Touchscreen 7-Day Programmable $71.99
Seagate Expansion 2 TB USB 3.0 Desktop External Ha $88.98 Sony ICFC414 Sony Clock Radio $16.99
Boss KIT-2 Complete 8 Gauge Amplifier Installation $10.99 Panasonic KX-TG6511B DECT 6.0 PLUS Expandable Digi $18.00
Panasonic KX-TG6511B DECT 6.0 PLUS Expandable Digi $18.00 Apple iPad Camera Connection Kit (MC531ZM/A) $18.90
Black Apple Ipod 5-in-1 Car Charger + Fm Transmitt $24.99 Logitech S150 USB Speakers with Digital Sound $7.44
Cisco-Linksys WRT54GL Wireless-G Broadband Router $34.89 Extra Long Black iPod / iPhone 3G, 3GS, iPhone 4 U $7.99
Belkin F3U133-16 Pro Series USB 2.0 A/B Cable (16 $2.96 SILVERSTONE SDP08 3.5 to 2 X 2.5-Inch Bay Converte $7.99
Laptop Replacement Battery for HP Pavilion $20.17 Logitech V220 Cordless Optical Mouse for Notebooks $5.99
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Prices current as of last update, 10/12/11 1:42pm.

Price is accurate as of the date/time indicated. Prices and product availability are subject to change. Any price displayed on the Amazon web site at the time of purchase will govern the sale of this product

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