Features:

• 3+1 speech module
• 2 Button audio speaker module
• Built in call tone generator and relay output for lock
• Improved weather sealing and electronics so as to withstand harsh environments.
• Will fit in the 800 and 8000 series housings
• Includes back lit name plate
• Requires 800 or 8000 series button modules
• Suitable psu is the 520M