22 preset channels with privacy codes for minimizing unwanted signals from others; Waterproof and dustproof (IP67) ; VOX allows for hands-free usage, automatically transmitting when user speaks ; Shock-resistant–can withstand 6.5 ft. drop; Bundle includes 4 radios, 4 headsets, 4 Li-Poly rechargeable batteries, 4 holsters, 2 dual charging bases, 2 micro USB cables, and 2 wall adapters;