Advantage:<br /><br />No need to change channels, 4 people can talk in the same time, one to two,three or four talking in 1000m.<br />Better than other intercom which need to change the channels in most people that are two to two talking.<br /><br />Fitment:<br /><br />Conference<br />Group discussion<br />Outdoor AC<br /><br />Please clink the link to look through the instruction:<br /><br />http:\/\/imgmgr.banggood.com\/images\/upload\/2015\/08\/V4 SKU262119 Instruction.pdf<br /> <br />Description:<br /><br />1.Bluetooth 3.0<br />2.Working speed above 120km\/h; <br />3.Automatic and safe receiving of mobile phone calls;  <br />4.Master control Bluetooth CSR BC5 scheme available; <br />5.Advanced A2DP &amp;amp; EDR Bluetooth function available;<br />6.Strong stereo music\/audio available (mobile phone\/MP3\/GPS with A2DP for transmission); <br />7.With FM<br />8.DSP noise reduction function<br />9.Inbuilt polymer lithium battery with capacity up to 500mA; <br />10.Standby 240h; <br />11.Continuous call or music playing above 8h; <br />12.Charging time around 3h; <br />13.National Level 5 waterproof standard; <br /><br />Instructions:<br /><br />Motorcycle Bluetooth interphone V4-1200 is designed for helmets.<br />This is bluetooth stereo headset, widely used for motorcycle helmets, bike users. <br />Full duplex calls allow you to talk with other partners simultaneously <br />The easy to access and intuitive button operations make Motorcycle Buetooth headset <br />a perfect companion for motorcycle riders and keep riders safe when riding.<br /><br />Key Features:<br /> <br />The Bluetooth system that allows the max call distance between two riders up to 1,000m <br />and actually realizes the fully duplex wireless communication among four riders. <br /><br />Specification:<br /> <br />Bluetooth Version: 3.0<br />Chip: CSR BC5<br />Battery capacity: 550<br />Battery Type: Polymer<br />Charge and discharge times: 500<br />Operating voltage: 3.3V-4.2V<br />Talk time: 8H<br />Standby time: 150H<br />Charging time: 2.5H<br />Radio frequency: FM87.5 ~ 108MHz<br />RDS: No<br />Speaker power: 0.25W<br />Waterproof:<br />Have TTS: None<br />Have automatic volume adjustment: no<br />Operating temperature range: -10 \u2103 to + 45 \u2103 (minimum and maximum operating temperature)<br />Charger Specifications: DC 5V 500mA<br /> <br />Package Included:<br /> <br />One intercom<br />One headset<br />One power charger (US and EU power can be optional)<br />One charging cable<br />One user manual<br />One helmet clip<br />One simple screwdriver