The Grado Labs GT220 voice-assistance headphones come with a wireless charging case that can charge them up to five hours. Once the battery runs low on the case, you can use the wireless or USB-C option. With up to 36 hours of battery life, the GT220 headphones are great for exercising, riding to work, and more. Most impressively, they feature voice assistance, so you can use the left side controls for phone and voice. Alternatively, the right side controls allow you to adjust music playback. Furthermore, these voice-assistance headphones feature a high-frequency response that’s natural without any stridency. Also, the midrange response is neutral and enhances the color in music. Overall, these voice-assistance headphones are convenient to have around and always ready whenever you want to listen to music.