A part of the review has been auto-translated.
As said "trance" receiver is very tiny. There is no bind pin, because it is an "autobind" procedure just like with small quadcopters. When switch on, receiver tries to bind with transmitter for about 3s (led is blinking). If receiver find a transmitter (must be also in bind mode) then it records transmitter identifier and works with it. If it can't bind with a transmitter then is retrieves previously bind transmitter identifier and works with it. This way, you save an extra pin and just need to bind only once. After bind procedure, If reception is ok then led if on, if no reception at all led if off, if reception if bad led is blinking ramdomly. I have tested this receiver with a small quadcopter transmitter (H36, compatible with flysky protocol) and it works really well. PPM and channel signals are "clean" on oscilloscope and range seems really good. More over, i think that we could increase range with a dipole antenna instead of original monopole antenna (easy to do because there is a ground pad just close to antenna pad).
Works perfectly after software upgrade. Use a pickit and banggood_micro_receiver_HITECHC18.hex file from Thierry. Negligible weight. Automatic pairing. 8 channel PPM (on the ch8 pin). Built in voltage regulator so can be powered from anything. Fail safe.