This is the :

ExcelRC DasMikro DSK-302 SANWA NANO V3

Improved power supply chip RX can support 1S-4S battery.  Better performance in low voltage

(1.5mm JST) 21mm x 12mm

Compatible Transmitters:   Sanwa M17 Sanwa M12 Sanwa M12S Sanwa MT44 Sanwa MT4
Sanwa MT4S Sanwa M11X