1、Precise Connector: This AC DC adapter features a 5.5x2.5mm DC connector with an outer diameter of 5.5mm and an inner diameter of 2.5mm, negative "-" for external and positive "+" for internal, ensuring a secure fit and reliability. 2、Optimal Power Output: With AC input of 50 to 60Hz and DC output of 7V 2A, the power supply operates best below 80% of full load to prevent overloading and ensure stable performance. 3、Comprehensive Safety Features: Equipped with five protective measures, over temperature, short circuit, under voltage, over voltage, and over current prevention, guaranteeing safe and secure use. 4、Robust And Long Lasting ABS Materials: Constructed from premium ABS, this AC DC adapter is wear proof and sturdy, with a 93cm/37in power cord for extended use and longevity. 5、Wide Compatibility: Compatible with a wide range of devices including LED advertising signs, LED display, light strip module, security cameras, scientific research equipment, LED lamps and lanterns, communicating equipment, power equipment, instruments, semiconductor refrigeration and heating, electronic refrigerators, LCD display, speakers, computer chassis, 2.5 inch mobile hard disk, mobile DVD, TV boxes, wireless sound and video equipment, MP3, MP4, routers, switches, game consoles, telephones, controllers and other equipment. Item Type: AC DC Adapter Material: ABS Power Cord Length: Approx. 93cm/37in Output DC Interface: Outer diameter 5.5mm/0.22in, inner diameter 2.5mm/0.1in with spring clip, also compatible with 5.5x2.1mm 1 x AC DC Adapter