Strictly necessary cookies are on by default and cannot be turned off. Functional, Performance and Tracking/targeting/sharing cookies can be turned on below based on your preferences (this banner will remain available for you to accept cookies). You may change your cookie settings by deleting cookies from your browser. Then this banner will appear again. You can learn more details about cookies HERE.
Strictly necessary (always on)
Functional, Performance and Tracking/targeting/sharing (default off)
4 dBm of Tx power is the max we can go within the class 2 requirement. In actual deployment, I wouldn't go beyond 10m for reliable connection, considering antenna efficiency as well as orientation.
BT has something known as RSSI. Essentially, if two devices are near to each other, they will reduce their required Tx power to talk to each other. And vice versa.
What is the range you are looking for? Bearing in mind that BT/BLE are PAN devices which are never intended for "long" range use. If you really want range, then you might want to consider using BT instead of BLE. The former can be configured as a Class 1 (up to 20dBm of Tx power) and will definitely have a much better range.
The metallic shielding could potentially have some negating effect on the RF radiation. I advise you seek out your HW engineers to come out with an optimum placement of the 20737S within your product.
You may want to use "LightBlue", an app available on iOS, to discover the module and take note of the received signal strength at say 5m, 8m and 10m. If you see something below -90dB, then you are nearing the limit already. In my opinion, I think -80dB is probably the weakest signal if you want to maintain some reliability...