Working voltage: AC110-240VAlarm current: ≤5WEncode IC: 1527 /330K ΩHumidity: 40% ~ 80%RHFeatures:2. 8-level volume settings for optimal listening comfort.4. Low standby power (0.5W) and alarm current (≤5W), making it energy efficient.1x PGST PJ-16 Smart Home Music Doorbell