AC adapter, output DC 9V, connector 5.5mm x 2.1mm, cable length approximately 2m. ※Used item (Used with BOSS TU-12 chromatic tuner) - Brand: National RD-9403 - Type: AC adapter - Input voltage: 100VAC (50/60Hz) - Output voltage: DC9V (Measured value 11.69V (no load)) See photo 4 0.5A (4.5W (VA)) - Connector type: DC jack Center - (negative) (Φ5.5×Φ2.1×9.5mm) ※Please use with extreme caution regarding polarity. - Cable length: Approximately 2m Thank you for viewing. Examples of usage> ⭐️Basically, for devices that can be used with DC9V 4.5W or less (Example 1) Please use with devices equipped with a socket compatible with plug Φ5.5×Φ2.1×9.5mm/center - (negative). However, please note: Use within the capacity of DC9V 0.5 A 4.5W! ※If you use it for DIY projects, please understand that it is at your own risk and use it with sufficient caution. ※Cleaned and disinfected with alcohol ※This is a used item, so please refrain from purchasing if you are sensitive to such things. ※Basically, returns are not accepted, so thank you for your understanding.