3D : http://goo.gl/Y1HiaJ

this plugs in a tablet/smartphone µUSB port and can replace :1 virtual joystick + 2 virtual buttons by1 physical joystick + 2 physical buttons6mm thick 30mm diameter, so a bit bigger than 2 2€ coins one on the other

the tiny orange button between the 2 other is the binding key

for buttons : keep touching the virtual button then press the binding key, it will blink, then press the button you want to bind to this tactile area

for joystick :if you want to replace a d-pad, do the same as button and push the stick up/down/left/right for the right direction (with this, when you don't fully push the physical joystick to a side, it will "PWM" the D-pad, so if you push it at 50% it will be like tapping quickly on the d-pad to get 50% of the speed, and when you push it betwen 2 directions, it will do one and the other quickly as well to get like both at the same time)but if you want to emulate a joystick, only press the binding key first, it will blink slowly, then touch the middle of the virtual stick and go all around it (not over the max because then it will be wrongly calibrated) like drawing a "Q" with your finger, and if you did it well, the binding key will stop blinking and you can start playing (if not press it to stop the blinking and restart the operation)