- Model: Valcom V‑9964 Stacking Feedback Eliminator
- Function: Digital feedback elimination and message stacking
- Power Requirements: 24 VDC, ~200–250 mA
- Input Impedance: 600 Ohm (line level)
- Music Input Impedance: 8–600 Ohm
- Audio Output: 600 Ohm loop or 8 Ohm line level
- Recording Capability: Multiple messages simultaneously
- Programming: Dip‑switch options (pre‑announce alert, priority override, DTMF cancel)
- LED Indicators: Power, record, play, busy
- Dimensions: ~11.76″ H × 7.10″ W × 1.72″ D
- Weight: ~2.6 lbs (1.18 kg)
- Mounting: Wall or 19″ rack mount