• Calus Round-10 earbuds feature Bluetooth V5.4 for stable, efficient wireless connection. • Hi-Fi surround sound quality provides an immersive audio experience for music and calls. • Offers approximately 4.5 hours of listening time on a single charge, suitable for daily use. • The charging case includes a digital display to clearly show the remaining battery status. • In-ear design ensures a secure and comfortable fit during various activities.