A cellphone ringer is a device that uses visual or other non-auditory ways to alert the deaf or hard-of-hearing to a phone call. Alerts can include higher volume levels, vibration and visual aids, such as lights.
Cellphone ringers usually have an adjustable volume with a maximum of 95 decibels. Ringing patterns and visual aids vary based on the product. Certain ringers have a bed shaker connection, which wakes a person up when his phone rings.
Ringers are available for both cellphones and landlines. They are also known as signalers or amplifiers. Ringers may connect to the phone through a cord or Bluetooth.