This device is an automatic voltage stabilizer from Stac, model ST3000W, and it is made in Japan. Maximum capacity: 3000 Volt-Amperes (VA). Output voltage: Supports two outputs with 110V and 220V. Control system: Relies on a servo-motor control system to ensure voltage stability. Features: Equipped with a circuit breaker for protection, and features a durable design suitable for homes and offices. Note: Ensure the device's capacity is compatible with your electrical equipment needs before use.