1. Compatible with FSK/ DTMF.
2. Max 100 groups incoming call memories(most recent).
3. Max 50 groups outgoing call memories (most recent).
4. Block 1000 groups unwanted phone numbers.
5. Block 5 groups area codes or prefixes(1-5 digits).
6. 4 levels LCD adjustable.
7. Block calls with no phone number displayed or private calls.
8. Retain stored data even lose power.
9. LED indicator for incoming calls.