JBL OpenSound Technology & Spatial Sound. Hi-Res Audio Wireless with adaptive bass boost. 4-mic crisp clear calls 2.0 with AI-trained algorithm. Adjustable ear hook for all-day comfort. Designed for all-day wear. Customizable through the JBL Headphones app. Up to 38 hours total playtime plus speed charge and wireless charging. Multi-point connection - pair two Bluetooth devices simultaneously. Dual connect and sync with Fast Pair. Driver size: 16.2mm/0.64" dynamic. Adapter and charging cable are NOT included.