**********Solid build portable walkie talkies; quality body and rotate button can withstand long time use and collision saving much money in the long run*****Good reception and crystal transmission sound; Strong penetration and audio keep you and your team always stay in contact with loud clarity sound quality in building or outdoor*****Keep away from the irrelevant call; ensure you and your team have quiet and smooth talk*****Superior accessories; coming with the " secret service " ear tubes help you keep clear call in noisy environment; durable belt clip and hand strap are convenient to carry; the charging base and adapter are convenient for you to charge it anywhere*****Have been set well could use directly when out of box; Emergency alarm will protect your safety when you work alone; this Version is certified and the FCC certified number is 2AAR8RT21