Main Features: - Noise reduction technology, canceling background noise effectively, make you enjoying pure and high-quality music - Rubber oil process and comfortable hand feeling - Curve earpad, more fit to the human ears - Bluetooth V4.0 technology allows the earphones communicate with your Bluetooth-enabled devices within 10m range - Advance microphones system for clear calls in windy or noisy environments - Support FM radio Specification: Bluetooth: V4.0 Transmission range: 10m Battery: 400mAh Li-ion battery Standby time: 250h Working time: 10h Charging time: 2.5h Impedance: 32 ohms Frequency: 20Hz - 20KHz TF Card: up to 32G 0.251 Package weight: 0.288 kg Product Size(L x W x H): 17.50 x 7.80 x 18.00 cm / 6.89 x 3.07 x 7.09 inches Package Size(L x W x H): 17.00 x 8.50 x 12.30 cm / 6.69 x 3.35 x 4.84 inches Package Contents: 1 x Headphones, 1 x USB Cable, 1 x English User Manual