The In-Ear Wireless Neckband series is ideal for running, workouts, and daily use. This category includes a horseshoe-shaped collar with a battery and Bluetooth transmitter that curves on the back. The True Wireless Series includes Bluetooth earphones with no cords connecting the earbud to the audio source/device. Because they don't have any wires, the microphone, controls, and battery are all built into the body of the bud. The True Wireless Series offers complete freedom of movement as well as simple charging via the case, making them ideal for a wide range of user requirements.