Intelligent system: automatic squelch system, automatic monitoring function, automatic memory function, automatic scanning function, automatic power saving, low battery alarm. Main parameters: 22 main channels and 121 privacy codes (2662 combinations), long distance on different terrains (up to 1/4/16 miles), ultra-long standby time (up to 3-4 days), powered by 3 AA batteries (did not include). Friendly design Palm-sized, lightweight (2.9 oz), hands-free capability (VOX), keypad lock (Channel Lock), adjustable power and volume, LCD screen with backlight, belt clip with lanyard hole, straps Dust plug 2.5mm headphone jack, durable and environmentally friendly material (ABS). Adult walkie-talkies for various occasions are easy to operate and carry even for children. So they are suitable for indoor and outdoor activities, such as home, shopping mall, CS games, camping, hiking, cycling, cruises, road trips, etc. With Topsung adult walkie talkies, you can keep talking to all family members or all of your family members. Also become a travel partner. Professional Service All adult are FCC certified, so you can exchange them for any reason within 30 days. If you have any questions, please feel free to contact us via email, we won't let you down