Otodel 12V DC Booster DCU2 This device boosts a 9V DC power supply to 12V. Simply input 9V to easily obtain 12V output. It's ultra-small and lightweight, so it doesn't take up much space. I purchased it but never used it. Velcro is attached to the back. This listing is for the unit only. 【Details】 Input: 9VDC (center negative) Output: 12VDC (center negative) Maximum usable current: 400mA Weight: Approximately 15g Size: 30 x 25 x 20mm (excluding protrusions)