Luxqueen&reg;Free Call Bluetooth 4.0 Headset - 24 Hour Longest Talk Time Wireless Headphone Earphone Earbud for Driving & Work (White) RapidConnect: Super easy and fast paring with your smartphone or other Bluetooth device The intelligent voice prompt: Voice reporting Turn on/off, Pairing, Max/Min Volume Bluetooth headset is a short distance wireless communication technology using by Low radiation Multipoint Technology: Pair it with two Bluetooth-enabled devices at the same time and don't miss your calls when you have two cell phones Longest talk time: Up to 24 hours of continuous talk time, 22 hours of music time, 720 hours (30 days) of standby time per charge cycle, always know when charging with iPhone battery display meter, Auto-turn off without connection for 10 min with Deep Sleep power-saving mode