1. This professional adapter charger is designed specifically for Boss Electronic Effects Pedal series, ensuring compatibility with models like BOSS GE-7, AD-2, BD-2, MT-2, OC-3, OC-2, RC-3, RC-30, and RC-202, among others. 2. The unique Polarity of D plug features inner Negative (-) outer Positive (+), with a maximum 2A output to cater to different amperage needs, such as 300mA, 500mA, 750mA, 800mA, 900mA, 1A, 2A, and more. Simply match the polarity information beside your device's power port for easy use. 3. Boasting specifications of 9V 2A output and 100V-240V, 50-60Hz input, this adapter charger comes with a DC Jack Diameter of 5.5*2.1mm & 2.5mm and a generous 6ft (1.8M) cable length, featuring a US mains plug with 2 pins for convenient use. 4. Stay protected with over-voltage, over-current, and short-circuit protection functions, ensuring the safety and longevity of your devices. The overload protection power rating of 120% offers peace of mind during operation. 5. Upgrade your Boss Electronic Effects Pedal experience with this reliable, high-quality adapter charger that combines performance, safety, and compatibility for a seamless user experience.