The Tronsmart Soundi R4 wireless headphones offer excellent sound quality with a balanced audio profile and deep bass, thanks to a 12 mm titanium driver. They feature an ergonomic design and customizable ear tips for high comfort and stability. The ENC technology reduces background noise, enabling clear calls even in busy places. These headphones are ideal for workouts and long journeys, as their built-in battery guarantees up to 28 hours of playback time. The Bluetooth version 5.3 provides an operating range of up to 10 meters. Technical details include a battery capacity of 35 mAh per earbud and a case with 400 mAh, as well as a USB-C connection type. With an IPX4 protection rating, they are water-resistant. Included accessories consist of additional pairs of ear tips and a USB cable. The material of the headphones is plastic.