There are special devices for hearing impaired people. They consist of a desktop alarm clock with a cable that is attached to the second part of the device a vibration motor with a protective case. The person preparing for a sleep puts the vibromotor under a pillow and in the morning the alarm clock vibrates. This solution has a several disadvantages. Firstly, the size of the case of the vibration motor is rather big. Secondly, sleeping with cables under the pillow is not always convenient. Basically, these devices are sold either in specialised stores or are ordered online.

Choosing an alarm clock a person is bound to face several problems which further complicate process such as the high price of 50 - 100 Euros as well as waiting for delivery or the lack of a specialised store nearby. Continuing the research we got into the problem deeper and found a lot of reviews and comments in various forums around the world, where people with similar problems ask if there are any special applications with advanced vibration or flash settings. No one gives a definite answer since at the moment there is no satisfactory solution on the market. Comparing applications at Apple Store and Google Play we have identified a number of problems faced by the user such as: lack of advanced vibration settings, inability to record vibration, lack of flexible control of light and sound signals, difficult interface and path to vibration settings, embedded advertising and price.