The SBA475ss alarm clock from Sonic Alert has an analog design with cool blue back light, fast and easy alarm setting, flashing light and a powerful bed shaker. Works with 110 or 220 volts (220 volt adapter not included). Features: Loud, 113dB adjustable volume and tone Easy to read, easy to set alarm No AM/PM to be confused with Hi/Low dimmer switch Snooze Battery backup up to 30 days (one 1.5V AA battery not included) retains clock and alarm times; backlight, bed shaker and sound will not operate during a power outage (Improved!) Clock display flashes blue light Powerful 12V bed shaker included Sound and vibration notification only Dimensions: 5-1/2" W x 3" D x 5-1/2" H May be used in Europe with European plug converter (sold separately) Eco-friendly green electronics uses 60% less energy (New!) Warranty One year warranty Brand Sonic Alert Product Type Alarm Clock Alarms Vibration, Sound Alarm Clock Style Desktop Lamp Plugin No Built-In Transmitter No Dimensions 5-1/2" W x 3" D x 5-1/2" H Battery Backup Yes