Features: Powering the device through the USB port is ideal for small electronic devices with a 4.0x1.7mm cylindrical socket. A-type male USB plug with 4.0mm (outer diameter) & 1.7mm (inner diameter) male coaxial/cylindrical plug, equipped with a positive center pin. Suitable for game consoles, fan, speakers, routers, can charging through any computer's USB port. Flexible USB to DC4.0x1.7mm cylindrical socket power cord, extendable charging cable, easy to carry, 75cm long, only suitable for 5V electronic devices. Pull both ends to change the length, the input voltages is equal to the output voltages, without changing the voltages function. Specifications: Name: USB to 4.0x1.7mm round hole 5V telescopic charging cable power supply cord Material: Plastic + Metal Color: Black Length: approx. 75cm/29.5inch, total length 1m/3.28ft Package Includes: 1 Piece USB to 4.0x1.7mm Retractable Charging Cable note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.