Sennheiser CX 120BT (508967) is an in-ear wireless neckband headphone designed for everyday use. It features Bluetooth 4.1 for stable wireless connectivity. With aptX, SBC, and aptX Low Latency support, it delivers high-quality, low-latency audio. It has a 28 Ohm impedance for balanced sound performance. Battery life lasts up to 6 hours with a 1.5-hour charging time via micro USB. A three-button remote allows easy control of music and calls. It includes multiple ear tip sizes for a comfortable fit and better sound isolation.