Topsung adult walkie talkies can achieve one-to-many communication with legal free license, so you can stay in touch with all family members or all your travel partners at the same time, there is no call charges will be generated. Topsung travel 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. ? Main Parameters ? 1. Long standby time ( Up to 3-4 days ) 2. Power by 3 AA batteries ( Not included ) 3. Long range in different terrains ( Up to 1 / 3 / 5 miles ) 4. 22 main channels and 121 privacy codes ( 2662 Combinations ) ? Smart System ? 1. Auto squelch system mutes the background noise to get crisp and smooth sound 2. Auto monitor function checks for signals fast with pressing monitor button 3. Auto memory function keeps all setting when the walkie talkies power off 4. Auto scan function finds active channel fast with a click of scan button 5. Auto switch to power saving mode when the radios are not in use 6. Auto remind you to charge or replace the batteries ? Friendly Design ? 1. Palm size 2. Lightweight ( 2.9oz ) 3. Hands free function ( VOX ) 4. Keypad lock ( Channel lock ) 5. Adjustable power and volume 6. Belt clip with lanyard hole 7. LCD screen with backlight 8. 2.5mm earpiece jack with dust plug 9. Durable and environmentally friendly materials ( ABS ) ? What You Get ? 1. 1 × User's Manual 2. 2 × Family Walkie Talkies 3. Amazon FBA Service 4. Topsung Friendly Customer Service