Expand your SynJ™ phone system by adding another handset. Handsets feature access to push-to-talk intercom, paging, call transfer and three-way conferencing. Built-in speakerphone allows handsfree use. Compatible with most headsets (via 2.5mm jack) and hearing aids. Lines: 4; Telephone Type: Cordless; Caller ID/Type: Handset; Speakerphone: Handset.