Hobbypower Neck Strap Balancer for Futaba Jr Walkera Spektrum Transmitter Designed for futaba /jr / radiolink / walkrea / flysky / esky / wfly ect. Transmitter. The neck strap balancer: connection mouth wide 3mm. Material:aluminum alloy. Functions: keeping balance and free your two hands. Balancer color:silver/ blue /red /black choose your favorite.