This is a PPM (pulse position modulation) encoder. This PPM encoder will encode regular PWM inputs into a single PPM output. This allows you to combine up to 8 channels from a regular RC receiver to a single wire PPM input for your flight controller e.g. Pixhawk or APM. The nice thing about PPM is that it will enable you to reduce all channels to a single wire, excluding ground and power lines. If you have a PWM (pulse width modulated) receiver, you will need a PPM encoder such as this one for it to work with a PPM only FC.
Support the input channels: 8.
Output: PPM SUM × 1 / MUX × 1.
Dimensions: 28 x 19 x 5 mm.
Weight: 12 gm. (containing all the input and output wires).