Graupner MZ-12 6 Channel Transmitter Set : Amazon.sg: Toys
Amazon.com: RadioMaster TX16S MKII MAX V4.0 Hall Gimbals Transmitter Remote Control ELRS 4in1 Version Support EDGETX and OPENTX (TX16S MKII MAX 4IN1 CBNRED M2) : Electronics
Graupner MX-12 Hott mod - adding switch and audio IN the remote ! DIY - YouTube