- Sonic Alert Sonic Boom alarm clock- Wakes up even the deepest sleepers- Wake to any bination of loud pulsating audio alarm flashing lights or shaking bed (vibrator sold separately)- Adjustable volume and tone control allow the most effective audio alert to be selected- Large bright green LED display with auto dimmer- Adjustable time display angle for easy viewing- Battery back-up (9V battery not included)- Compatible with Sonic Alert"s plete line of signaling products such as telephone doorbell and baby cry alerts (patented technology)- 5 Year limited manufacturer"s warrantySASB1000