Sennheiser CX True Wireless In-Ear Sound Isolating Headphones connect wirelessly via Bluetooth. It comes with 7mm dynamic drivers that deliver extra bass and enjoyable music. It is compatible with devices like smartphones, desktops, TV, tablets, laptops, etc. The headset's noise-reducing microphone provides crystal clear communication without cracking vocals. Its battery lasts up to 27 hours. It gives 33 feet wireless Bluetooth range. Also, its passive noise cancellation technology prevents unwanted background noise. It is IPX4 water-resistant. The buds' frequency response is 5Hz to 21kHz. You can enhance the bass with its EQ modes.