This bluetooth headset stands out others in its delicately small and compact size, portable light weight, ultra humane design and multiple functions. Obviously, you will see a clip to the reverse of it, which is for clipping on user's collar or other convenient clothing that can be clipped on. When clipped, it reminds you of a call by vibrating itself. You will never worry about missing a call. When you notice, you just need to pull the line and get the earbud to your ear and talk. When you finish, take the earbud off and a single press on the rewind button will rollback the line where it was. Answering a call with such a bluetooth headset, you can keep on driving or do other things. It is really practical and convenient for businessmen and drivers. Specifications: Brand: Wsound Bluetooth version: V4.0 compatible with V3.0, 2.1, 2.0, 1.2 Model: F900i Dimensions: 55x25.5x14mm(LWH) Weight: about 23g Line length: about 35cm Transmission range: 10m Working temperature: 0-50 degree Charging time: about 1-2 hours Talk time: about 8 hours Music time: about 5 hours Standby time: about 120 hours What's in the box: 1x bluetooth headset 1x usb charging cable 1x user manual How to connect? Ensure the heaset is off and press the water-drop function key for about 7 seconds until the indicator flashes blue and red alternatively. Search for F900i in the bluetooth setting on your cell phone. Finally, click connect. How to realize muti-point connection: 1. Connect F900i with mobile A. Then turn off A's bluetooth. 2. Connect F900i with mobile B. 3. Turn on bluetooth of A. They will connect with A&B at the same time.