This 12V 3A Power Supply Adapter is perfect for 12V devices less than 36W, such as speaker, LED strip lights, router, external hard drives, CCTV camera, mobile DVD, monitor and more. Indoor use only! Product Features: - Safety Protection: Built in software under voltage and over-voltage protection, short-circuit protection, over-current protection, over temperature protection, no spark when plug in, quiet and not overheat, no need to worry about any fires, explosions or shocks occurring, make sure your device works normally while charging. Voltage Consistency: No voltage fluctuations at power on, during transmit, receive, or at power off. The power adapter will protect your electronic products from destruction. Warning: In order to avoid damage your devices, Please confirm whether your device is compatible to our adapter before purchasing.