The SOHO Conference phone comes with everything you need to start conferencing immediately: Phone, 120/240VAC Wall Adapter and Phone Interconnect Box; 18" Wall Adapter; RJ-11 Phone Cord and Power Cord. $100 worth of FREE conferencing included. * SOHO Speakerphone has "echo cancellation" and active noise reduction utilizing SoundClear DSP (Digital Signal Processing). Clear and natural 2-way communications (full duplex). New upgraded 5 Watt Speaker included for a deeper sound. * 3 built-in "Omni-Directional" microphones provide 360º coverage for a 20" x 20" room. Expand your speakerphone coverage for by adding 2 optional external microphones for larger rooms (sold separately). * Fully Expandable: Add Bluetooth or PBX, Digital compatability by adding optional modules via the Accessory bay. Not necessary to upgrade to a new conferencephone to obtain this functionality. * Speakerphone has "Redial" and "Flash" buttons. Volume up and down toggle switch. Standard keypad "0" through "9" and # buttons. Status LED light indicates power and muting. CES Innovation Award Nominee in 2010