Tips: Pairing mode: Keep pressing the switch on/off Button until Blue light remains Bright,then you can search for I4S and connects with the headset With the unique sleek outlook design and extremely clear voice quality , Bluedio I4S combines the advanced BluetoothV3.0 technology and humanized design to present a sound phone conversation and give you a little bit more to appreciate the essence of music! Are you still looking for a perfect Bluetooth headset to match your Iphone? Undoubtedly Bluedio I4S is the most suitable Bluetooth headset for your iphone. With the beautiful design of Bluedio I4S,you can"t resist its temptation! BluedioI4S Technical Specification: Bluetooth Version: 3.0 Operating Distance: 10m Music Playtime/Talk Time: Up to 7hrs Standby Time: Up to 130hrs Headset weight: about 9.6g VOIP: Support Multipoint Technology: Yes Music Streaming: Yes Multi-function Button On/Off: Yes Standard Bluetooth Features: Yes Supported Profiles: A2DP AVRCP HFP1.5 HSP1.1 Accessories I4s Headset 1pc USB Charging Cable 1pc Headset Cord 1pc User Manual 1pc