Retevis H-777S Walkie Talkie FRS Frequency License-Free Security Two Way Radios(10 Pack) with Programming Cable H-777s is a license-free version of Retevis H-777; It has more features and better performance inside and outside of the building than H-777 Great range, great volume and super compact with great battery life; 1100mAh battery capacity fully charge about 3 hours, while stand by 3 days Scrambling function encrypts your voice so that unrelated people can not hear clearly your conversation with your teams Vox function achieves transmission activated by your voice, no need to press PTT to talk Easy to use and work directly when out of box; 1 year warranty and 30 days no reason to return