PLL or crystal, 137-199 MHz and 400-499 MHz, POCSAG.
Please notice that the frequency you use.
One device just with 4MHz bandwidth.
The frequency can be customized in the frequency range, 4MHz bandwidth you can program when come out factory.
your order 1x 439.9875MHz, you just can use 437.9875-441.9875 MHz
You can not use 458.6625MHz when you customize 439.9875MHz
Default frequency is 439.9875MHz.
1x USB ID Programming cable
Not include AAA Battery