Genuine Sony AC-E455D AC Power Adapter 4.5V 500mA For Sony Audio Products - Used Sony Walkman and Discman: It was commonly bundled with or used as a replacement adapter for portable CD players and MiniDisc players. Other Sony Audio/Video Devices: Some compatible models include MP3 players and MiniDisc recorders that require a 4.5V DC input. Battery Replacement: It allows users to operate their devices without relying on disposable batteries, making it ideal for home or stationary use. Output: 4.5V DC, 500mA Input: 120V AC, 60Hz (some versions support 100?240V for international use) Connector: Round barrel plug (approx. 1.7 x 4 x 10 mm) Protection Features: Over-voltage, over-current, and short-circuit protection2. Compact and lightweight (approx. 250g) Wall-mountable design for convenience