M120 Pro drone 4G loudspeaker payload weighs 691g. Max sound pressure 124dB, effective broadcast distance up to 500m. Supports 4G LTE and analog dual link. Pitch angle 0‑80 degree. Controlled by Android APP, supports text‑to‑speech recording and audio playback. Built‑in SIM and TF card slot, supports ethernet and datalink connection. Quick release design compatible with drone gimbal port. Ideal for emergency rescue traffic guidance and public announcement missions.