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The model FRS Base Station 21-1845 was easier to use after it was initially set up with the desired tone and frequency as it was less likely to be accidentally tuned off channel. However the newer model 21-1846 has the ability to operate on three memorized channel and tone pairs that could be matched with other units for specific room or office paging. Overall the simplicity or the older 21-1845 seems more desirable in most situations and thus the upgraded 21-1846 just has too many buttons and button combinations to be as simple to maintain once deployed. Both models operate within the FRS spectrum which can be overcrowded depending on where you live, but not so bad as you might think. Even though considered outdated and not operating on optimal frequencies, both the models 21-1845 and 21-1846 hold their own by today's standards and are light-years ahead in quality as compared to the terrible Chinese made Wuloo and other abomination intercom clones on the market today. The model FRS Base Station 21-1845 was easier to use after it was initially set up with the desired tone and frequency as it was less likely to be accidentally tuned off channel. However the newer model 21-1846 has the ability to operate on three memorized channel and tone pairs that could be matched with other units for specific room or office paging. Overall the simplicity or the older 21-1845 seems more desirable in most situations and thus the upgraded 21-1846 just has too many buttons and button combinations to be as simple to maintain once deployed. Both models operate within the FRS spectrum which can be overcrowded depending on where you live, but not so bad as you might think. Even though considered outdated and not operating on optimal frequencies, both the models 21-1845 and 21-1846 hold their own by today's standards and are light-years ahead in quality as compared to the terrible Chinese made [[Wuloo / Qniglo FRS Intercoms]] and other abomination intercom clones on the market today.