CEA-40 Audible & Visual Telephone Call Alert product overview, from Connected Products

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Audible & Visual Telephone Call Alert with Flashing Light & Adjustable Ringing Volume
The CEA-40 Telephone Call Alert is a telephone line-powered loud ringer and flashing light which plugs directly into a telephone socket. The unit flashes and rings alongside your phone to grab your attention - an ideal solution for the hard of hearing, or for use in noisy environments.
The CEA-40 is compatible with most telephones (not digital systems) with a standard BT-style line socket and does not require any additional cords or adaptors - it simply plugs into your telephone to produce a loud ring and a flashing alert - no mains power required.
Simple to install and use - The CEA-?? is a simple plug and play solution. With our easy to follow instructions, set up is quick and straightforward.
Compact yet Capable - The CEA-40s compact dimensions (approx. 85x60x25mm) mean you can easily position it as required and is capable of increasing your telephone ringer up to 95dB.
Highest Quality - All CEA Assistive products are manufactured to the highest standards.
The CEA-40 comes supplied with all accessories needed to connect it to your wall socket and telephone - no need for any additional items.

[@skakdosmer]

Thank you. The frequency is clearly too high for older people (and the sound is ugly). I own an old fashioned mechanical bell ringer which is much better, but I don’t wish to part with that, and my mother needs one.