Smart System: Auto squelch system, Auto monitor function, Auto memory function, Auto scan function, Auto power saving, Low battery alert.^ Main Parameters22 main channels and 121 privacy codes(2662 Combinations), Long range in different terrains(Up to 1/4/16 miles), Long standby time(Up to 3-4 days), Power by 3 AA batteries(Not included).^ Friendly DesignPalm size, Lightweight(2.9oz), Hands free function(VOX), Keypad lock(Channel lock), Adjustable power and volume, LCD screen with backlight, Belt clip with lanyard hole, 2.5mm Earpiece jack with dust plug, Durable and environmentally friendly materials(ABS).^ Various Occasionsadult walkie talkies are easy to operate and carry even for kids. So they are suitable for indoor and outdoor activities, such as home, mall, cs games, camping, hiking, cycling, cruise ship, road trip, etc. With Topsung adult walkie talkies, you can keep talking with all family members or all your travel partners at the same time.^ Professional ServiceAll adult walkie talkies have got the latest FCC certification, so you can return for replacement with any reason in 30 days. Please contact us by email without hesitation if you have any question, we will not let you down