Feature: 1. PLUG AND PLAY: No power supply required, no need to change any part of the original radio, just bring two handheld radios. Uses two handheld radio headset jacks to form a very useful small repeater box. 2. INCREASE CALL DISTANCE: UV VU crossing band, frequency difference of at least 5MHz to get a good condition, increase the call distance. 3. TWO WAY FORWARDING: When machine A receives, machine B transmits; when machine B receives, machine A transmits. Realize two way forwarding function. 4. APPLICATION: Walkie repeater box is suitable for cable erection site construction, underground mine, cave construction, culvert emergency succor, small basement and ground intercom signal connection and other scenes. 5. EASY INSTALLATION: K head two way repeater box is easy to install, durable material, can be used for a long time, stable performance. Specification: Item Type: K Head Repeater Box Material: PC, ABS Plug Type: K Head Compatible Models: for TYT for Kenwood. Package List: 1 x K Head Repeater Box