I have a Braun 4520 thermometer that has has a blinking what looks like a megaphone. Changed batteries and still won’t work. Can you help me?

Question edited for clarity, and spelling 'brain' to Braun, and 'thermoter' to thermometer, 'comes in' to comes on..
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There are some ideas here, but it sounds faulty and needs warranty return or repair.

https://www.google.com/search?q=Braun+thermoscan+hm3+not+working

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If your Braun Thermoscan 6022 thermometer is not switching on even after you have replaced the batteries, there could be a few possible causes:

1. Battery installation: Make sure that you have inserted the batteries correctly, with the correct polarity. Check the battery contacts for any corrosion or debris and clean them if necessary.
2. Battery type: The Braun Thermoscan 6022 requires two AA alkaline batteries. If you have used a different type of battery, such as rechargeable batteries, this could be the reason why the thermometer is not turning on.
3. Battery life: Even if the batteries are new, they could be defective or may have run out of charge quickly. Try replacing the batteries with a fresh set of AA alkaline batteries.
4. Reset: Try resetting the thermometer by removing the batteries for at least one minute and then reinserting them. This can sometimes help to reset the internal electronics of the thermometer.
5. Faulty thermometer: If none of the above steps work, it is possible that the thermometer itself is faulty. In this case, you may need to contact Braun customer support for further assistance or consider purchasing a new thermometer.

IF this is from something sticky on it or just plain wear, the best thing to use is armour all. It is a silcon based protectant that is slippery.

this is manual for 4520.... Braun Ear Thermometer Owner Manual ManualsOnline com

is the drawer that its stored in, in the bathroom? the humidity or moisture could affect it. I have had mine for 8 yrs and works perfectly. Are you placing the probe covers on correctly and waiting for it to click or a pop before inserting into ur ear.?

So a very simple fix is to just clean the corrosion from the battery terminals inside the thermometer. You'll need a Torx T9 screwdriver (Maplin, eBay, Amazon, maybe pound shops).

If you whish to switch from Celsius to Fahrenheit, proceed as follows:

(1) Make sure the thermometer is turned off.

(2) Press and hold down the Start button (IRT 4020)
or the «I/O» button (IRT 4520). After about
3 seconds the display will show this sequence:
«°F» / «SET» / «°C» / «SET» ...

(3) Release the Start button / «I/O» button when the
desired temperature scale is shown. There will be
a short beep to confirm the new setting, then the
thermometer is turned off automatically.

... call Braun ThermoScan customer service at 1-800-327-7226

Changing the temperature scale Your Braun ThermoScan is shipped with the Fahrenheit (°F) temperature scale activated. If you whish to switch to Celsius (°C) and/or back from Celsius to Fahrenheit, proceed as follows: (1) Make sure the thermometer is turned off. (2) Press and hold down the Start button (IRT 4020) or the «I/O» button (IRT 4520). After about 3 seconds the display will show this sequence: «°F» / «SET» / «°C» / «SET» ... (3) Release the Start button / «I/O» button when the desired temperature scale is shown. There will be a short beep to confirm the new setting, then the thermometer is turned off automatically.