1) Identifying by the serial number
See How to find the serial number of Smiley Terminal.
The serial numbers of Smiley Terminal V3 and X3 have 14 characters. The fifth letter specifies the version: V is Smiley Terminal and X is Smiley Wall.
The serial numbers of V1 and V2 have 10 digits. The fifth digit specifies the version: number 0 is V1 and number 1 is V2.
2) Identifying by the physical appearance
Smiley Terminal V3
Smiley Terminal V2: the L-bar is plastic
Smiley Terminal V1: the L-bar is metal
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