JBL Synchros Slate Powered Over-Ear Stereo Headphones, Black Lightweight steel headband and leather ear cushions. Universal remote/microphone cable. Compatible with popular smartphones, feature phones & tablets - iPhone, Android, and Windows JBL Professional Audio Sound with PureBass performance. JBL's LiveStageTM digital signal processing enhances headphone audio to recreate the experience of listening to a live performance. Powered by 2 AAA batteries, proprietary LiveStageTM signal processing technology delivers a more realistic sound experience. Premium 50mm driver Frequency response: 10Hz - 22kHz Maximum SPL: 117dB @ 30mW Rated Power input: 30mW Connections: 3.5mm jack