QK Nano receiver is based on the ExpressLRS project, an open-source RC link for RC applications. ExpressLRS aims to achieve the best possible link performance in both speeds, latency, and range. This makes ExpressLRS one of the fastest RC links available while still offering long-range performance.
These are based on ESP8285 as mcu, which provides you the option to flash via wifi, via uart or via betaflight passthrough.
Please go through the link here to find how to flash QK ELRS kits using ELRS Configurator
Weight: 1.11 grams without antenna or wire
Antenna: UFL or ceramic as per choice.
Input Voltage Max: 5.5V
1 * QK ELRS Nano receiver
2 * Spare shrink tube