Digi-Wave 400 Series Personal Communication System

Ideal Use Cases

The Williams AV Digi-Wave 400 Series Personal Communication System is designed for two people who need to talk and listen to each other wirelessly without interference. Its portable format supports confidential boardroom discussions, legal proceedings, courtroom communication, business meetings, factory tours, interpretation, guided tours, and hearing-assistance applications. The 2.4 GHz frequency-hopping system and optional encryption PIN help control access when conversations involve sensitive information. For larger groups, the system can be expanded with separately purchased DLT 400 transceivers or DLR 400 rechargeable and alkaline receivers.

Why Choose This Model

This model combines two-way wireless communication with a compact, lightweight transceiver design. Each transceiver measures 4.22 inches wide by 2.60 inches high by 0.50 inches deep and weighs 3.3 ounces with its battery. The built-in 1800 mAh lithium-polymer battery provides up to 16 hours of talk time per charge when operating with one transmit and one receive channel. An automatic sleep mode activates after five minutes without a compatible RF signal, helping conserve battery power. The black and silver enclosure uses black ABS plastic for portable everyday handling.

Installation and Integration

The Digi-Wave system is intended for portable setup and operation. An internal microphone is available for direct use and is disabled when the microphone jack is engaged. The 3.5 mm microphone connection supplies electret microphone bias and provides adjustable gain across a 63 dB range. USB-C supports adjustable line-level input and output as well as charging, while a 3.5 mm TRRS headphone jack provides 25 mW output at 32 ohms. Charging takes approximately five hours. Two charging contacts also support use with the CHG 412. Compatible receivers include the DLR 400 RCH and DLR 400 ALK; the DLT 300 and DLR 360 are compatible with some limitations.

Performance Highlights

The system operates in the 2.4 GHz ISM band from 2402 to 2476 MHz using FHSS and FSK modulation. Its specified operating range is up to 900 feet, or 274 meters, depending on environmental conditions, with RF output rated at a maximum of 19 dBm. Audio frequency response reaches 100 to 11,500 Hz in interpretation, tour, and hearing-assistance configurations using four or fewer microphones; other modes are rated from 100 to 7,200 Hz. The specified signal-to-noise ratio is 73 dB A-weighted, and total harmonic distortion is 0.1 percent at the default volume and 1 kHz. Side tone is set 6 dB below volume, with off, low, and high tone settings available.

What Makes It Different

Digi-Wave combines frequency hopping with several security options. The system supports 87-bit encryption for 300 Series compatibility, 87+128-bit encryption, an encryption PIN, and a settings lock. These controls are suited to environments where limiting unauthorized listening is important. An OLED provides operating information, while a red LED around the Talk button indicates when talk is enabled. A bi-color LED at the top changes between green and red. The ability to add DLT 400 transceivers and DLR 400 receivers also allows the system to grow beyond its initial two-person configuration.

Final Assessment

The Digi-Wave 400 Series Personal Communication System brings together two-way wireless operation, portable dimensions, long battery life, adjustable audio connections, and controlled-access communication. Its broad operating range and expansion options make it adaptable to professional meetings, tours, proceedings, and other mobile communication settings. The specified operating temperature range is 14 to 113 degrees Fahrenheit, or -10 to 45 degrees Celsius. Approvals include FCC, Industry Canada, CE, RoHS 3, WEEE, RCM, ANATEL, KC, and Giteki. Warranty coverage is two years against component failure and manufacturing defects, with one year of coverage for the internal battery.