Calus N9pro Neckband Wireless Headphone.

Headphone. Connectivity: Features Bluetooth V5.4 for a stable connection. Audio: Provides Hi-Fi quality sound and heavy bass. Battery: Offers up to 20 hours of continuous playback time on a single charge, with a standby time of 90 days. Design: Designed for sports with a comfortable, real silicone neckband, magnetic attraction on the earbuds, and a built-in microphone for calls.