Features 1.No need for power supply, compact and portable, plug and play, easy to operate. 2.No need to change any part of the original walkie-talkie, only two handheld walkie-talkies are needed. 3.Connect to two handheld walkie-talkies with the headset jack to form a practical and small repeater. 4.High quality guaranteed, stable performance, you can use it with confidence. 5.Environmentally friendly and safe, without any harmful substances, you can use with confidence. specificationItem Type: Relay Box Material: ABS Plug: K Plug Colour: Black Type: Portable Distance: 5-8km in open space, 1-2km with densely populated buildings Two-way: Yes Gross Weight: Approx. 101.00g Package Size: Approx. 14x10x3cm/5.5x3.9x1.2in Working Mode: 1. Different frequency uplink and downlink forwarding (and conventional relay station). A machine as the signal uplink receiver, and B machine as the signal downlink transmitter, thus to achieve the relay purpose. 2. Two-way forwarding, when the A machine receives, 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 of audio trigger mode. The volume of the intercom as a receiving signal should be adjusted to the maximum when using. Prompt for single/two-way relay box frequency setting. PackageList1 x Relay Box1 x Connecting Line