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| [* black] Just like its predecessor, the A51 also features an optical in-display fingerprint scanner which is placed near the daughterboard. | |
| [* icon_note] Optical fingerprint sensors work by illuminating the finger and taking an image of the bright and dark areas representing the ridges and valleys of the fingerprint. ([https://www.ifixit.com/News/14385/how-ultrasonic-fingerprint-sensors-work|More on fingerprint sensor technology.|new_window=true]) | |
| [* black] The daughterboard comes out without a fuss and brings the USB-C plug and the beloved 3.5 mm audio jack to light. | |
| - | [* black] A dedicated audio jack reduces wear and tear on the USB-C port, which is nice. Both ports are soldered place though, so replacing one individually will require soldering skills. |
| + | [* black] A dedicated audio jack reduces wear and tear on the USB-C port, which is nice. Both ports are soldered in place though, so replacing one individually will require soldering skills. |
| [* black] That said, this configuration is better than the [guide|120331|single-board Galaxy S10|stepid=232002|new_window=true]! At least this tiny daughterboard can be swapped out with relative ease should one or both ports fail on you. |