Digi-Wave rechargeable only receiver 400 version

Ideal Use Cases

The Williams AV Digi-Wave 400 Rechargeable Receiver is designed for listeners who need to hear a presenter wirelessly through a compatible Digi-Wave device. Its 2.4 GHz ISM-band operation and frequency-hopping algorithm support secure presenter-to-listener communication without a fixed audio connection. The rechargeable design is suited to applications that require extended listening time, a dedicated headphone output, and visible operating information.

The receiver has a stated range of up to 900 feet (274 meters), depending on environmental conditions. Compatibility includes the DLT 400 and the DLT 300 with some limitations, making this model suitable for supported Digi-Wave 400 and 300 Series configurations.

Why Choose This Model

The DLR 400 RCH combines a compact enclosure with extended battery operation. It measures 4.22 inches wide by 2.60 inches high by 0.50 inches deep and weighs 3.3 ounces (94 grams), including the battery. Its internal 1800 mAh Lithium Polymer battery provides up to 32 hours per charge when operating as a one-channel receiver.

An Auto Sleep Mode activates after five minutes without an RF signal from a compatible device, helping manage available battery power between active sessions. Approximate charging time is five hours. The black receiver also includes an OLED indicator and a bi-color LED at the top that changes between green and red.

Installation and Integration

Audio monitoring is available through a 3.5 mm TRRS headphone jack rated at 25 mW with an R32-ohm specification. A USB-C connection provides adjustable-level line audio output, giving the receiver an additional integration path for compatible audio equipment.

Charging can be completed through USB-C. Two additional charging contacts support use with the CHG 412. Wireless operation uses the 2402–2476 MHz range with FHSS, while FSK modulation and the frequency-hopping algorithm manage the radio connection. The listed compatible units are the DLT 400 and DLT 300, with some limitations applying to DLT 300 compatibility. The receiver is specified for operation from 14 to 113 degrees Fahrenheit (-10 to 45 degrees Celsius).

Performance Highlights

The receiver operates in the 2.4 GHz ISM band and supports a range of up to 900 feet (274 meters), subject to environmental conditions. Its audio frequency response is 100–7,200 Hz in Intercom Mode and 100–11,500 Hz in other modes. Published audio measurements include a 73 dB A-weighted signal-to-noise ratio and 0.1 percent total harmonic distortion at the default volume and 1 kHz.

RF sensitivity is specified at 92 dBm, and the listed refresh rate is 200 Hz. System voltage specifications are 14 VDC for the OLED, 5 VDC for RF, and 3.3 VDC for logic. Together with the OLED display, top-mounted bi-color LED, headphone output, and adjustable USB-C line output, these specifications provide detailed operating and audio connection information directly on a compact receiver.

What Makes It Different

Security is a central feature of the Digi-Wave 400 receiver. The listed options include 87-bit encryption for 300 Series compatibility, 87+128-bit encryption, an encryption PIN, and a lock for settings. This combination addresses both protected wireless listening and control over receiver configuration.

The model also brings together long battery life, USB-C charging, CHG 412 charging contacts, two available audio-output formats, and support for compatible Digi-Wave generations. Listed approvals include FCC, Industry Canada, CE, RoHS 3, WEEE, RCM, ANATEL, KC, and Giteki.

Final Assessment

The Williams AV DLR 400 RCH is a compact rechargeable receiver for secure wireless listening to a presenter through the Digi-Wave platform. Its strongest specifications include up to 32 hours of one-channel receiver operation, up to 900 feet of range under suitable environmental conditions, FHSS operation, multiple encryption options, and both headphone and adjustable USB-C audio outputs.

Warranty coverage is two years against component failure and manufacturing defects, with one year of coverage on the internal battery.