Elecom Headset for Smartphone. Interface type: 3.5 mm, Cable length: 1.2 m, Headset connectors supported: 3.5mm stereo. Ear coupling: intraaural, Headphone frequency: 20 - 20000 Hz, Headphone sensitivity: 100 dB. Compatible products: Apple iPhone 3G iPhone 3GS iPhone 4 HTC Desire Desire S Desire HD Desire Z 7 Pro Wildfire Sensation. Compatibility: Multi, Maximum input power: 0.1 W