Wireless Earbuds,Voice control via Siri and Google Assistant With Active Noise Cancelling,Wireless charging case with integrated Li-polymer battery (350mAh),With integrated Li-Ion batteries (30 mAh each) for up to 4.5 hours of music,Pressure sensor directly on the headphones for convenient music control and call management,Bluetooth Version: 5.2,Frequency range: approx. 20-20,000 Hz,Material: Plastic,Earbuds Size: 3.3 x 2.2 x 2.4 cm,Charging Case Size: 6.1 x 4.7 x 2.4 cm