1. Whitelist max up to 1500 groups in 15 digits.
2. Blacklist max up to 1500 groups in 15 digits.
3. Incoming calls max up to 100 groups in 15 digits.
4. Outgoing calls max up to 50 groups in 15 digits.
5. Block area codes max up to 20 groups in 10 digits.
6. Retain stored data even lose power.
7. 5 levels LCD adjustable.
8. LCD display in 15 digits.
9. Backlight function.
10. FSK/ DTMF dual system.