K4 is a 4-stage air-drop system designed for emergency material delivery. Featuring 4 independent hooks and a 1080p camera at the bottom, it enables precise, muti-point and batch delivery with enhanced mission flexibility. Compact and lightweight design, K4 weights only 265g but each hooks can load max 5kgs, total carrying capacity up to 20kgs. Supports UART, SBUS, PWM and DJI PSDK control, excellent compatibility support it widely used in multiple UAV delivery especially in emergency cases.