**********RT48 two-way radio can be used directly; it has 16 channels and rich functions; it can be used out of the box; and it can be used directly with RT22 RT21 RT28 H-777S*****Unique and different; the RT48 2 way radios waterproof are designed for skilled professional who refuses to compromise; high performance audio and advanced features allows efficient operation in business team communications*****Rugged and durable 100% waterproof walkie talkies; designed to withstand rain and wind; exposure to salt fog; blowing dust on all surfaces; vibration and extreme temperatures*****Local remote alarm function can send emergency alerts to each other among team members; provide reliable communication for team*****The 2 way radios provide sufficient range for most applications; provide a lot of flexibility; operating well both outdoors and in and around structures