Retevis RT7 Two Way Radios with Earpieces UHF 16 CH FM Walkie Talkies with 2 Pin Covert Acoustic Tube Earpiece(5 Pack) RT7 have been set to same frequency so that can work together directly;easy to operate for all groups FM radio and built-in LED flashlight provide additional visibility in dark environments 2 pin covert acoustic tube earpiece offers convenience and versatility in noisy or discrete environments 1000mAH battery capacity can charge 2-3 hours then you can use it for 8-12 hours continuous use or longer Simple and Convenient return process;1 year warranty and 30 days no reason to return 1000mAh battery Every radio have two kinds of earpiece