Retevis MateTalk B4 Walkie Talkies Instruction Manual

1. Introduction and Overview

The Retevis MateTalk B4 Walkie Talkies are designed for clear and reliable communication in demanding environments. Featuring AI-powered noise reduction, a waterproof shoulder mic, and long-lasting battery life, these compact and rugged two-way radios are ideal for construction sites, workshops, and other professional settings requiring robust communication solutions.

2. What's in the Box

• 4 x B4 Walkie-Talkie with 1200mAh battery
• 4 x Waterproof Shoulder Mic
• 4 x Charging Base
• 4 x Type-C Charging Cable
• 4 x Charger Adapter

3. Key Features

• AI Two-way Noise Reduction: Utilizes an AI model trained on over 100,000 data samples to reduce environmental noise (e.g., jackhammer roars, heavy machinery din) with a 25dB SNR boost and 65dB echo cancellation, ensuring clear voice transmission and reception.
• Waterproof Shoulder Mic: The included speaker microphone is IP54 waterproof, featuring a capacitive electret microphone for clear voice pickup even in noisy conditions.
• Long Battery Life: Equipped with a 1200mAh battery, providing up to 30 hours of standby time and 19 hours of continuous use, minimizing charging interruptions during long shifts.
• VOX Hands-Free Communication: Activate Voice Operated Exchange (VOX) with a long-press of the side key, allowing for communication without needing to press the PTT button, ideal for tasks requiring both hands.
• Compact and Rugged Design: Weighing only 140g (0.31lb) and constructed from durable ABS material, these radios are designed to fit comfortably in tool belts or pockets and withstand harsh working environments.
• Emergency Alarm: Includes an emergency alarm feature to enhance safety and connectivity during critical situations.

4. Product Details and Components

Figure 4.1: Front and side view of the Retevis MateTalk B4 Walkie Talkie with labeled components including Channel switch knob, Volume/Power knob, Tx/Rx LED indicator, PTT button, Side key 1, Side key 2, Speaker, Type-C/Accessory port, and Microphone.

Figure 4.2: Diagram illustrating the AI Two-way Noise Reduction technology, showing how background noise is filtered during transmission and reception for clearer communication.

Figure 4.3: A worker on a job site using the Retevis MateTalk B4 Walkie Talkie with the attached IP54 waterproof shoulder microphone, highlighting clear communication in noisy environments.

Figure 4.4: A worker demonstrating the VOX hands-free communication feature of the Retevis MateTalk B4 Walkie Talkie, allowing focus on tasks without interruption.

Figure 4.5: A visual comparison showing the improved clarity of communication with noise reduction enabled on the MateTalk B4 Walkie Talkies versus without it, in a noisy construction setting.

5. Setup

5.1 Battery Installation

1. Locate the battery compartment cover on the back of the walkie talkie.
2. Slide the cover downwards following the arrow indicator to open.
3. Align the 1200mAh lithium-ion battery with the contacts inside the compartment.
4. Gently press the battery into place until it clicks securely.
5. Slide the battery compartment cover back upwards until it locks.

5.2 Charging the Battery

The MateTalk B4 walkie talkies can be charged using the included Type-C charging cable directly or via the charging base.

• Using Type-C Cable: Open the rubber cover on the side of the walkie talkie to reveal the Type-C port. Insert the Type-C cable into the port and connect the other end to a charger adapter or a compatible USB power source.
• Using Charging Base: Place the walkie talkie into the charging base, ensuring the contacts align. Connect the charging base to a power source using the provided Type-C cable and charger adapter. The indicator light on the radio will turn red while charging and green when fully charged.

Figure 5.1: The MateTalk B4 Walkie Talkie being charged directly via its Type-C port and also placed in its dedicated charging base.

5.3 Belt Clip Attachment

The belt clip can be easily attached to the back of the walkie talkie by sliding it into the designated slot until it clicks into place. This allows for convenient carrying on a belt or pocket.

5.4 Shoulder Mic Connection

To connect the waterproof shoulder mic, open the rubber cover on the side of the walkie talkie that protects the accessory port. Insert the 2-pin connector of the shoulder mic firmly into the port until it is secure.

6. Operating Instructions

6.1 Power On/Off and Volume Control

Rotate the top-most knob clockwise to power on the walkie talkie. A voice prompt will announce

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