Gecheer YINITONE RC-108 Relay Box for Two Way Radios, Simple K Port Handheld Intercom Repeater, No Power Required, 2.5mm 3.5mm Jack, Black ABS for Long Distance Communication Up to 10km

1. Extends communication range by over 10 kilometers for handheld two-way radios, enabling long-distance connectivity in remote or signal-challenged environments; ideal for outdoor adventures, construction sites, and emergency operations where reliable radio contact is essential.

2. Simple plug-and-play design requires no external power supply or modifications to your walkie-talkies; connect two portable radios via 2.5mm or 3.5mm mic/spk ports to the relay box for immediate use, ensuring fast setup without technical complexity.

3. Built with high-quality ABS material for durability and resistance to wear and impact, this compact repeater box supports stable signal transmission and reception while maintaining long service life under tough field conditions.

4. Suitable for diverse applications including underground mining, cave rescue, culvert inspection, large event coordination, and intercom between basement and ground levels; enhances team communication across challenging terrains and structures.

5. Supports multiple operating modes including downlink transmission, two-way forwarding, and audio-triggered relay; works seamlessly with K port compatible radios like Kenwood and other major brands for flexible deployment in both conventional and differential repeater setups.