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 for deaf, hard of hearing or deep sleepers. 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 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 Feature Details Primary Use Home Brand Sonic Alert Mfg part # SBA475SSG Warranty One year warranty Color Grey / Silver Weight (lbs) 1.55 Battery operated? Yes (batteries optional) Batteries included? No Battery details (1) AA Alkaline Country of Manufacture China Alert Type(s) Vibration Flashing Light Loud Audible Yes Yes Yes Tone Control Yes Dual Alarms No Battery backup Yes Built-in USB charger No Bluetooth No Smartphone Compatibility iOS Android No