Each walkie talkie is preprogrammed with 16 channels, can be used right out of the box, channel programmable with programming cable(sold separately).UHF Frequency range, 2 Watt output power. Any number of Ansoko two-way radios can be used together as long as they are on the same channel and within the available range, reception range 0.6-3.5 miles depending on the terrain. 1500mAh rechargeable battery, supports 8-12 hours communication under typical use, each radio has its separate charging base, don't need to share charging base between two way radios. 50 CTCSS/105 DCS privacy codes to expand the use of frequencies(accessible with programming cable), built-in LED torch for use in emergency or travel condition, emergency alarm featured. Hassle-free customer support, 30-day return, 1-year warranty on walky talky and accessories. This device has been granted FCC authorization for both transmit and receive, fully complies with FCC rules. FCC ID: 2AJGMBF-888S