Hitec RCD Hitech RCD 27724 High Response 2.4GHz RX Axion 2 Receiver Race-ready high response 2.4GHz micro 2-channel receiver 4Ms frame Rate hitec high response (her) system Fail-safe / hold function, extra port (am) for lap counter interface Dimensions: 1.26 x 0.89 x 0.43in, (32 x 22.3 x 11mm), weight: 0.247oz (7.0G)