1-Line Phone System. Supports up to 9 simultaneous handsets (sold separately). Extreme wireless range up to: 6 floors, 25,000 sq. ft. in warehouses, and 10 acres in open areas. Speakerphone in handset. 2-Way intercom. Broadcast to multiple handsets from any handset. Single Line. Operation Frequency: 902~928MHz (option for 902~915MHz & 915~928MHz). Up to 400mW/-111dBm transmit power. Phone book: 50 entries. Soft menu key. Speakerphone in handset. Broadcast (independent with base). Intercom (independent with base). User friendly MMI. Key guard. Transmit power control. Adjustable microphone gain. Handset group setting. Type I/II caller ID. DTMF/FSK Caller ID. Message waiting detection (VMWI). 4-line LCD display. Call on hold. Build-in music on hold. Rapid charging. Mute. Baby monitor. Call manager (Call barring for incoming/outgoing call). Any key answer. Feature call: 10. Adjustable flash time. Wall mountable. Supports Up to 9 Handsets. Earphone call control. 2.5mm headset jack. Ringer/ vibrator.