R37 Bluetooth Sports Earphones 

Basic Connectivity

• Uses Bluetooth 4.2 wireless connection for pairing with devices such as smartphones, tablets, and laptops.

• Wireless range of approximately up to 10 meters / ~33 feet in open space.

Design & Physical Features

• In‑ear / sports‑style earphones often with a neckband or anti‑lost design to keep them secure during activity.

• Lightweight and ergonomic for workouts and daily use.

• Ear tips usually made of silicone with multiple sizes included.

Battery & Playback

• Reported playback time (music) is approximately up to ~5 hours on a single charge.

• Talk time is similar — around ~5 hours.

• Standby time is claimed up to ~150 hours.

• Charging typically via a USB cable (often micro‑USB included).

Audio & Controls

• Built‑in microphone for voice calls.

• Basic on‑wire control buttons for volume, track skip, and call handling.

• Frequency range noted around 20 Hz – 20,000 Hz (typical for budget Bluetooth earphones).

Compatibility

• Works with any Bluetooth‑enabled device (phones, tablets, laptops, mp3 players).