Feature:1. SIZE AND POLARITY: DC power cord with 5.5mm x 2.5mm DC plug. Outer diameter 5.5mm, inner diameter 2.5mm. Polarity: Negative - externally, positive + internally2. EASY TO USE: The speaker system charger power supply cord has a 93cm/37in cord length with a circlip, plug and play, and the ABS material is lightweight and long lasting3. WIDE APPLICATION: Speaker charger is suitable for LED billboard, LED display screen, luminous characters, security, scientific research equipment, industrial control equipment, communicating equipment, electric power equipment, instruments and meters, semiconductor refrigeration and heating, air purifier, electronic refrigerator, liquid crystal display, LED lamps, mobile DVD, TV box, wireless sound and video equipment, charging equipment, MP3 or MP4, small desk lamp, router, switch, game console, color lights, controller digital and other household or portable equipment4. FIVE PROTECTING AND SECURITY GUARANTEE: Speaker power supply adapter charger support over temperature protect, short circuit protect, under voltage protect, over voltage protect, over current protect5. INPUT AND OUTPUT: The speaker power supply supports 50-60Hz AC input and 18V 3A 54W DC output. Use less than 80% of full load is recommended. Do not overloadSpecification:Item Type: Speaker Power Supply Adapter ChargerMaterial: ABSOutput DC Interface(ODxID): Approx. 5.5 x 2.5mm / 0.22 x 0.1in with circlip, also compatible with approx. 5.5 x 2.1mm / 0.22 x 0.08inCord Length: Approx. 93cm / 37in.Package List:1 x Speaker Power Supply Adapter ChargerNote:Please confirm that the length will meet your needs before purchasing.