Mini Black USB Car Charger for iPhone 4 - $0.97 from Meritline
Manufacturer Part # 111
Specification:
Input voltage:Car charger:DC12V-24V
Output:USB DC 5V
Ripple voltage:<100mV
Operating efficiency:> 85%
End charging current::1000mA
Over-current protection
Short-circuit protection
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Mod: Edited title for clarity
Be careful with these. My friend bought a cheap one to use in her car and it blew the fuzzy wuzzy on the cigarette lighter.