Feature 1 No power supply needed, plug and play. 2 There is no need to change any part of the original walkie-talkie, just take two handheld walkie-talkies. 3 Use two hand-held walkie-talkie headset jacks to form a very practical small repeater through this relay box. 4 Intelligent operation, easy to use. 5 Lightweight and compact, easy to carry.Features: No power supply needed, plug and play. 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. Intelligent operation, easy to use. Lightweight and compact, easy to carry. Specification: Material: ABS Plug: K head Colour: Black Type: Portable Distance: 5-8 km from open space, 1-2 km from densely populated buildings Whether it is two-way: yes Line length: Both sides are 90cm/35.4in long (Left and right) Package list: 1 * Relay Box Working Mode: 1. Different frequency uplink and downlink difference forwarding (and conventional relay station), A machine as the signal uplink receiver, and B machine as the signal downlink transmitter. The relay has been achieved. 2. 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. 3. 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. 4. One-way relay box forwarding mode (regular repeater mode)! The A machine receives the signal and the B machine transmits the signal. The receiving/transmitting machine must be set to two different frequencies. The frequency set by the conventional transmitter is higher than the receiver frequency, and the high/low frequency is low. The high/low frequency difference is generally 10M, and the larger the frequency difference, the better. 5. Do not reverse the jack of the one-way relay box during use, otherwise the relay box will not work. 6. 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. Notes: 1. This relay box is an audio trigger mode, so please adjust the volume of your walkie-talkie to the maximum when using it, otherwise there may be no forwarding status. 2. If the transmission delay time is too long (more than 3 seconds), the transmitter's transmitting antenna is too close to the relay box to cause the transmission signal to interfere with the relay box! The external walkie-talkie antenna can be used to solve the interference problem!