REMAX RB-S21 IPX8 Bone Conduction Waterproof Sports Earbuds, 28g Ultra-Lightweight, 360° Flexible, Designed for Swimming, Running, and Gym Use

The REMAX RB-S21 is a bone conduction sports earphone with an IPX8 waterproof rating, supporting use at a water depth of 2 meters. It is suitable for swimming and other water sports, as well as running and fitness. The entire unit weighs approximately 28g, and the ear hook can bend 360°. It features a fully enclosed sound chamber design to reduce sound leakage. The open-fit design does not need to be inserted into the ear canal, allowing you to hear ambient sounds at the same time. Available in black and white, priced at HK$238.

Product Features

• IPX8 Waterproof · Use at 2m Water Depth: The seamless, hole-free body with a fully sealed waterproof structure achieves an IPX8 waterproof rating. It can be used for swimming in pools, snorkeling, surfing, and other water sports. It continues to produce sound normally even when submerged at a depth of 2 meters, and is also resistant to sweat and rain.
• Lightweight 28g · 360° Bendable Ear Hook: Weighing approximately 28g, the highly elastic memory ear hook supports 360° free bending and folding, fitting securely during exercise.
• Fully Enclosed Sound Chamber · Reduces Sound Leakage: Transmits sound through the ear bone with a fully enclosed chamber structure to suppress sound leakage.
• Open-Fit Listening: No need to insert into the ear canal. When running or cycling, you can hear surrounding vehicle and human voices at the same time.
• 190mAh Battery: Takes approximately 1.5 hours to charge, providing approximately 5 hours of continuous playback and approximately 76–100 hours of standby time.

Specifications

Usage Scenarios

Suitable for swimming, snorkeling, surfing, and other water sports, as well as outdoor activities such as running, fitness, and cycling.

Frequently Asked Questions FAQ

Q1: Can you really wear them while swimming?
Yes. The RB-S21 has an IPX8 waterproof rating and supports use at a water depth of 2 meters, making it suitable for swimming in pools, snorkeling, and other water sports.

Q2: Will bone conduction earphones leak sound?
This product features a fully enclosed sound chamber structure that transmits sound through the ear bone and suppresses sound leakage.

Q3: How long does it play on a full charge?
The 190mAh battery takes approximately 1.5 hours to charge and provides approximately 5 hours of continuous playback and approximately 76–100 hours of standby time.

Q4: Will they fall off while running?
The ear hook is made of highly elastic memory material, which can bend 360° and fit the ear contour. The entire unit weighs only approximately 28g.

Q5: What colors are available?
Available in two colors: black and white.

Q6: Can you hear outside sounds while running with them on?
The open-fit design does not need to be inserted into the ear canal, allowing you to hear surrounding ambient sounds while listening to music.