1. In-ear headphones - Universal type - Compatible with 5 handheld devices, 1 radio frequency wireless headphone, and over-ear headphones. Suitable for computers, TVs, radios, and microphones. Highlights: Universal type; Supports 5 handheld devices, 1 radio frequency wireless headphone, and over-ear headphones. Suitable for computers, TVs, radios, and microphones. 5 - in - 1 wireless headphones, suitable for computers, TVs, radios, Skype, and come with a microphone. The product will be shipped according to the color or size shown in the main picture on the product page. 2. Product details - Features: Adjustable headband, embedded on/off switch. - Color: Black. - Wireless technology: Radio frequency. - Headband design details. - Headphone design: Earmuff type (over - ear). - Connection method: Infrared wireless, 3.5 - millimeter plug. - Usage method: Portable. - Audio type: Headphone. 3. Main parameters - Receiving frequency: 86 - 108MHz. - Speaker diameter: 40.00 mm. - Modulation method: Frequency modulation/Radio frequency. - Receiving sensitivity: 0DB. - Impedance: 32. - Transmission distance: 30 meters (in a 360 - degree open space). - Maximum output power: 3 milliwatts. - Sensitivity: 110DB (at 1kHz). - Transmission power: 5 millivolts. - Operating voltage: 3.0V (2 AAA batteries). - Rated power: 15 milliwatts. - Operating current: 12 milliamps. - Current dynamic operating current: 5 milliamps. - Power capacity: 150 milliwatts. - Operating voltage: 3.0V (2 AA batteries). - Signal - to - noise ratio (S/N): > 45DB. - Frequency response: 20 - 20kHz.