The Digi-Wave 400 series is the next generation of digital communication systems. A new, intuitive user interface, charging dock and pairing option have been added to the DW300 series. This simultaneous, two-way system helps you hear in everyday situations –and you can easily access two-way communication with the push of a button. Perfect for classrooms, the Digi-WAVE 400 maximizes a student’s ability to hear, ensures that the teacher’s message is heard clearly, and provides the option for student Q&A. Purchase additional transceivers for this system for multiple speakers and additional receivers to accommodate multiple listeners (see Accessories tab). DLT400 Features: The DLT 400 Transceiver features full-duplex capability, supporting up to four simultaneous talkers in two-way mode, and up to six simultaneous talkers in intercom mode. Slim, lightweight, and simple to set up and use. One or two-way operation offers flexibility in an array of applications. With the push of a button, users can access two-way communication for immediate interaction or Q&A.Typical range up to 325 feetUp to 14 hrs talk time per charge / Approx. 5 hrs charging timeLithium Polymer battery with smart charge built into transceiverEasier-to-read, more intuitive OLED display screen73 dB signal-to-noise ratioVolume and tone controlUse with earphones, headphones or neckloop (see Accessory tab)3.5 mm TRRS stereo/mono headphone jackAuto Sleep Mode after 5 minutesUp to 4 simultaneous talkers in two-way modeUp to 15 simultaneous channels (Interpretation mode)Up to 4 simultaneous groups (2-way mode)Up to 4 simultaneous talkers per group (2-way mode)Up to 6 simultaneous talkers per group (2-way Intercom mode)2.4 GHz (ISM band); 2402 – 2476 MHz FHSS frequencies Secure encryption; 87 bit (300 series compatible), 87+128 bit for 400 series4-PIN group security code, Security lock on program set-up.Approved by FCC, Industry Canada, CE, RoHS 3, WEEE, RCM, ANATEL, KC and GitekiDimensions: 4.22W x 2.60″H x 0.50″DWarranty: 2 years parts and labor (90 days on accessories); 6 months on internal battery Includes: (2) DLT 400 transceiver(2) MIC 144 headset microphonesCCS 061 GR grey silicone skinCCS 061 BK black silicone skin(2) DW ACC PAC4 power supplyCCS 043 system carry case