Instructions to obtain the serial number on K-Touch devices

K-Touch W650 K-Touch W650
K-Touch W619 K-Touch W619
K-Touch W610 K-Touch W610
K-Touch W606 K-Touch W606
K-Touch V8 K-Touch V8
K-Touch U90 K-Touch U90
K-Touch U9 K-Touch U9
K-Touch U86 K-Touch U86
K-Touch U83T K-Touch U83T
K-Touch U81T K-Touch U81T
K-Touch U7 K-Touch U7
K-Touch U6 K-Touch U6
K-Touch TOU CH3C K-Touch TOU CH3C
K-Touch Tou CH3 K-Touch Tou CH3
K-Touch Tou Ch 2 K-Touch Tou Ch 2
K-Touch T96 K-Touch T96
K-Touch T91 K-Touch T91
K-Touch T810 K-Touch T810
K-Touch T789 K-Touch T789
K-Touch T780 K-Touch T780