Oaktree Products Inc, St Louis, offers the Clarity AlertMaster® AL10 Visual Alert System, which visually notifies users of activity in the home.
The system visually alerts one to the telephone, doorbell, alarm clock, and other motions or sounds by flashing a lamp, vibrating a bed shaker, and lighting up the side lights and icon image on the base unit. No hardwiring is needed.
Available accessories include the baby cry monitor, which wirelessly connects with the system to monitor additional sounds and motion.
[Source: Oaktree]
