iflight External Microphone OS-121 for DJI OSMO Handheld 3 Axis Gimbal DJI OSMO Accessories When recording with OSMO,we found the fan noise and the noise from the press buttom will be recorded so we designed this external microphone to solve the problem Comes with 39.37inch(1m) wire, use freely Ship to USA via USPS first class proprity mail, estimated delivery 5-10 days