Dual Dynamic driver deliver High Definition sound with decent bass, clear mids and transparent treble. The A/B switches are specially designed to switch between iOS and Android devices for maximum efficient settings. Excellent inline microphone for hands-free conversations and convenient communication. 3 Pairs of soft silicone ear buds in different sizes provide best comfort for everyone. Works with smartphones, tablets, computers, MP3 players CD players and other devices with 3.5 mm port.