Options for this item: Colour:Pink Features: CT 5.1 technology provides higher data transfer speed, more stable and faster connection and lower power consumption. Real wireless double ear design, left and right headphones are separated. It can be used as a single or double. Touch control design, no pressure in your ears. It is easy to control music and calls and activate the voice assistant. In the internal microphone in both ear -tulled headphones with smart noise reduction feature, provides a clearer speech sound in stereo mode. 250 MAH charging box can charge and store headphones. The 30 mAh battery on each headset provides about 5 hours of music time. Features: Brand Name: Lenovo Model Number: LP1 PRO IT version: 5.1 Transmission distance: Driver Diameter: 10mm Frequency Range: 20-20kHz Sensitivity: 104DB