V4 Plus 4 Perfon Group Bluetooth Intercom for Referee Our V4 Plus bluetooth intercom supports up to 4 person pairing and talk at the same time. Key Feature Advanced Bluetooth 5.1 Version The advanced Qualcomm Bluetooth chip with optimized Bluetooth version 5.1 dramatically increase the transmission rate and while keep the low-energy consumption. Clear and Stable Sound With improved CVC noise reduction technology, the high-fidelity speakers also can make the sound you hear clear and stable. Referee Intercom Accessories Comes with all the accessories you need for installation, and it's easy to get started right away. IP65 Waterproof With IP65 waterproof, the headset could handle almost all weather conditions. Product Parameter Bluetooth version: 5.1 versionSupport: CVC noise reduction, 3D soundIntercom distance: Up to 1500 meterTalk Time: 18 HoursStandby Time: 260 HoursWaterproof rating: IP65 Wide Applications In addition to soccer referees, V4 Plus is suitable for driving coaches, venue scheduling, construction sites, volleyball, and other outdoor activities. It is also suitable for communicating with companions while riding a bicycle. Q1: Do you need cell phone reception to use this? A1: Not necessary. The intercom can be connected with another via Bluetooth without cellphone reception. Besides, you can connect your phone to listen to music, make calls as a headset. Package List 2 Pack Package List: 2*V4 Plus referee intercom; 2*Ear Speaker and Microphone; 2*Charging Cable; 2* Armband for Referee; 2*User Manual 3 Pack Package List: 3*V4 Plus referee intercom; 3*Ear Speaker and Microphone; 3*Charging Cable; 3* Armband for Referee; 3*User Manual 4 Pack Package List: 4*V4 Plus referee intercom; 4*Ear Speaker and Microphone; 4*Charging Cable; 4* Armband for Referee; 4*User Manual V4 Plus Referee Intercom FBIM Professional Referee Intercom Mesh F6 Referee Headset HIFI Earphone V6 Pro Referee Intercom Add to Cart Add to Cart Buying Options Add to Cart Buying Options Customer Reviews 4.3 out of 5 stars 92 4.0 out of 5 stars 65 5.0 out of 5 stars 1 4.0 out of 5 stars 65 4.0 out of 5 stars 47 Price $279.98$279.98 $567.66$567.66 — no data $19.99$19.99 $89.99$89.99 Number of Pieces 4 4 6 1 2 Simultaneously Conversation 4 Person 4 Person 6 Person 1 Person 2 Person Intercom Toggling 4 full-duplex real-time intercom 4 full-duplex real-time intercom 6 full-duplex real-time intercom 4 full-duplex real-time intercom 1 host switching to other 5 Talk Time 24 Hours 19 Hours 19 Hours 10 Hours 12 Hours Talking Distance 800 M 1500 M 1000 M 1000 M 800 M Noise Cancellation Technology CVC CVC CVC DSP DSP Hands-free Communications ✓ ✓ ✓ ✓ ✓