Mitel BB424 Phone Expansion Module

The BB424 is an excellent tool for operators, receptionists, assistants, and supervisors who need visibility over other users as well as single-button access to advanced telephony features including transfer, silent monitor, and barge in. It has a 4.3-inch (272x480 pixels) backlit color LED display with 24 programmable buttons. The BB424 is a USB accessory for the IP485g IP phone featuring four page buttons across the bottom to program up to 96 buttons total.