Congratulation for use the WT-0188 walkies-talkic. This is a FM Duple communication system, using 902 928 Mhz Band allowed by FCC-15, it sends an receives messages concurrently utilizing two different frequencies, this unique mode ¢ operation allows partners to talk at the same time without push-to —talk buttons. 1. Full duplex operation without push-to talk buttons 2. (CPU) Synthesized circuitry DIP switch programmable 3. 40 Chanel combination 4. 902 — 928Mhz frequency 5.