MYLAPS 10R078 RC4 Hybrid Transponder [Compatible with RC2/3/4 decoders]
Compatible with RC2/RC3/RC4.4/RC4.5 decoders. New design: half the size and half the weight of the RC2 transponder. Old AMB transponder. Compatible with 1-4 cell LiPo. Weight 4.7 g (with holder).