Optimal HD voice with 3 built-in microphones Full duplex technology Echo cancellation 10-foot (3-meter) 360° voice pickup Up to 20-meter connection distance with CP965 11-day standby time and 13-hour talk time Intuitive capacitive mute buttons 360° nondirectional charging on charger cradle DECT Technology Package content: 2 x CP Wireless Expansion Microphone, Charger Cradle, 0.3 m Micro USB Cable, Quick Start Guide