TWINBIRD Waterproof CD player "CD ZABADY" AV-J166BR (Brown) Maximum output: 0.5 W + 0.5 W /  Connection terminal: AC adapter terminal / headphone Mini stereo jack terminal /  Speaker size:  4 cm  2 (stereo speaker) /  Supported media: CD / CD-R / CD-RW / 8 cm CD Product dimensions: about 200  80  230 mm /  Product weight: about 820 g (product only) Waterproof specification: equivalent to JIS IPX 7 Power supply: 2 power supply method /  1 Alkaline AA batteries  4 (sold separately) /  2 dedicated AC adapter (sold separately) /  Battery duration: continuous use about 9 hours (CD continuous playback with alkaline dry batteries) Japanese Instruction Manual URL (PDF):http://data.twinbird.jp/file/manual_pdf/avj166_m.pdf