【Audio Trigger Mode】This relay box is an audio trigger mode. When using it, the volume of the intercom as a receiving signal should be adjusted to the maximum! Single/two-way relay box frequency setting prompt.
【Two-way Forwarding】When the A machine receiver, the B machine transmits. When the B machine receives, the A machine launches. The two-way forwarding function is achieved.
Here’s a rephrased version of the provided text:
【Parameters】The portable relay box consists of ABS material. Plug type: K-type, color: black. Supports bi-directional functionality: yes. Cable length: both sides measure 90 cm (35.4 inches) each (left and right). Effective range: 5-8 km in open areas and 1-2 km in high-density urban environments.
【Plug and Play】No power supply needed. There is no need to change any part of the original walkie-talkie, just take two handheld walkie-talkies. Use two hand-held walkie-talkie headset jacks to form a very practical small repeater through this relay box.
【About Two-way Relay Box Plug】 Two-way relay box plug does not divide input/output, two-way relay box forwarding mode: A machine receives B transmission, B machine receives A transmission.