Tecsun R-9012 AM/FM/SW 12 Bands Shortwave Radio Receiver Gray Power supply: 2 (AA) Size Batteries (not included) DC 3V (adapter not included) Size: 3.1 x 5.0 x 1.1 in (80 x 126 x 28 mm) Weight: 7.1 oz (200 g) Accessories: 1 x English User Manual About the adapter: R-9012 power jack is negative inside, positive external, Amazon's recommended adapter can not match R-9012