80-8841-00 Synapse Expansion Module — Up to 24 Feature Key Assignments; Compatible with SB67020/SB67030/SB67031; Up to 2 per Desket; Max 10 per System

Add programmable keys with the 80-8841-00 Synapse Expansion Module. Each module supplies 24 assignable feature keys and includes Busy Lamp Field (BLF) capability for extension status monitoring and quick one-touch dialing. Works with SB67020, SB67030 and SB67031 units; up to 2 modules may be paired per Desket and a maximum of 10 modules can be deployed across the system.