● Headphones that listen to TV audio wirelessly. (Uses a dedicated transmitter) Pairing with your smartphone via Bluetooth. You can listen to music with a memory card alone. You can also use the included audio cable to make it wired. Adjustable length. Foldable and packable, convenient to carry. 1.6 inch (40 mm) dynamic driver for immersive 3D sound. Headphones: Effective Distance: Up to 32.8 ft (10 m); Driver: Dynamic (Diameter 1.6 inches (40 mm), CCAW Voice Coil); Playing Frequency Band: 15 - 28,000 Hz; Impedance: 38 Ω; Sensitivity: 9 dB/mW; Weight: Approx. 6.5 oz (180 g); Continuous Usage Time: Approx. 0 hours (Submitted to call). Machine: Dimensions: Approx. 2.1 x 0.9 x 0.4 inches (54 x 23 x 10.5 mm); Weight: Approx. 0.3 oz (8 g); Compliance Standards: Slightly weak radio waves