Type:In-Ear Headphones Drivers/Features:6.0 × 5.1 mm speaker, Four-microphone technology, Hear through technology, IP56-rated Frequency response:20 Hz to 20 kHz Connectivity:Bluetooth® 5.0, Up to 8 devices, 2 devices can be connected at a time Battery:Talk-time up to 5 hours of battery life, 15 hours with charging case, Charging time 2 hours with dedicated USB wall charger (500 mA)