Retevis RT21 Walkie Talkies 16CH FRS Two Way Radio VOX Scrambler&nbsp;2 Way Radios(5 Pack) with 2 Pin Covert Air Acoustic Earpiece (5 Pack) Have been set well FRS frequency could using directly when out of box Every radio equipped with their crystal earpiece and keep your smoothly communication Built-in scrambler can enhance your communication safety and block strange interference Strong radio body and long range will empower your business with efficient working way Simple and Convenient return process;1 year warranty for radio body and 2 month warranty for accessories;and 30 day return with no questions asked