4 People Group Intercom: V4 Plus allows 4 sets of devices to connect at the same time in a maximum intercom range of 1500 meters. 4 riders can freely share the riding experience and enjoy the conversation. | Hands-free Communication: Connecting to the upgraded Bluetooth 5.1version, V4 Plus motorcycle Bluetooth interphone can automatically answer or reject calls within 5s. You could also listen to music and road conditions with FM radio while riding. | Advanced Noise Reduction Technology: With improved CVC noise cancellation technology, it reduces surrounding wind and background noise. You are allowed to enjoy Bluetooth stereo voice with high definition sound quality during riding at a high speed. | Large Battery Capacity: V4 Plus motorcycle helmet Bluetooth headset runs on a 750mAh large rechargeable battery. With just 2 hours of charging, the intercom working time can reach 18hours and the standby time can reach 150hours, suitable for long-time riding. | Waterproof and Compatibility: With IP65 waterproof, the headset could handle almost all weather conditions. It is compatible with full-face helmet, 3/4 helmet, flip-up helmet and most half-face helmets which can cover ears. The motorcycle helmet Bluetooth headset can withstand 14℉ to 122℉ and can be used in most countries and regions.

Referee Essentials: In soccer games where referee radios are commonplace, hygiene is a top concern. Keep your worries at bay by having spare headsets on hand. They also serve as a great backup in case of accidental damage. | Referee Earpiece: This single-ear headphone accessory features a rugged microphone and is purpose-built for our V4 Plus, V6Pro, and FBIM soccer football referee intercom systems. | Crystal-Clear Audio: Our advanced noise reduction technology ensures clear and stable sound, even amidst the roar of a crowded stadium. Enjoy high-fidelity audio every time. | Universal 3.5mm Jack: Sporting a standard 3.5mm round headphone jack and a generous 3.6-foot cord length, it's compatible with a wide range of devices, including mobile phones and MP3 players with a 3.5mm connector. | Feather-Light Design: Crafted for comfort, these referee headset earpieces are feather-light and feature easy-to-use ear hooks. They are a must-have for soccer referee communications. Your purchase includes 2 left-ear earpiece.

Referee Essentials: In soccer games where referee radios are commonplace, hygiene is a top concern. Keep your worries at bay by having spare headsets on hand. They also serve as a great backup in case of accidental damage. | Referee Earpiece: This single-ear headphone accessory features a rugged microphone and is purpose-built for our V4 Plus, V6Pro, and FBIM soccer football referee intercom systems. | Crystal-Clear Audio: Our advanced noise reduction technology ensures clear and stable sound, even amidst the roar of a crowded stadium. Enjoy high-fidelity audio every time. | Universal 3.5mm Jack: Sporting a standard 3.5mm round headphone jack and a generous 3.6-foot cord length, it's compatible with a wide range of devices, including mobile phones and MP3 players with a 3.5mm connector. | Feather-Light Design: Crafted for comfort, these referee headset earpieces are feather-light and feature easy-to-use ear hooks. They are a must-have for soccer referee communications. Your purchase includes 2 right-ear earpiece.

Upgraded 4 People Group Intercom: This referee communication system allows 4 referees to connect at the same time in a maximum intercom range of 1500 meters. 4 referees can talk at the same time and keep in touch with the situation on the field freely. | Clear and Stable Sound: With improved CVC noise cancellation technology, it reduces surrounding wind and background noise including whistles. So that the sound you hear is more clear and stable even in a noisy stadium. | Wide Applications: V4Plus is an excellent partner for most competition referees like football referees, basketball referees, golf referees, etc. In addition to referees, V4 Plus is suitable for daily training, construction sites, venue scheduling and other outdoor activities. | Large Battery Capacity: V4Plus headset runs on a 750mAh large rechargeable battery. With just 2 hours of charging, the intercom working time can reach 18hours and the standby time can reach 150hours, which can meet the needs of long-time referees communication. | Waterproof: With IP65 waterproof, the headset could handle almost all weather conditions. The Bluetooth headset can withstand 14℉ to 122℉ and can be used in most countries and regions.

Referee Essentials: In soccer games where referee radios are commonplace, hygiene is a top concern. Keep your worries at bay by having spare headsets on hand. They also serve as a great backup in case of accidental damage. | Referee Earpiece: This single-ear headphone accessory features a rugged microphone and is purpose-built for our V4 and V6 soccer football referee intercom systems with Type-C interface. Don't support F6 or 3.5mm version. | Crystal-Clear Audio: Our advanced noise reduction technology ensures clear and stable sound, even amidst the roar of a crowded stadium. Enjoy high-fidelity audio every time. | Length: 4.1-foot cable length. | Feather-Light Design: Crafted for comfort, these referee headset earpieces are feather-light and feature easy-to-use ear hooks. They are a must-have for soccer referee communications.

4 People Group Intercom: V4 Plus allows 4 sets of devices to connect at the same time in a maximum intercom range of 1500 meters. 4 riders can freely share the riding experience and enjoy the conversation. | Hands-free Communication: Connecting to the upgraded Bluetooth 5.1version, V4 Plus motorcycle Bluetooth interphone can automatically answer or reject calls within 5s. You could also listen to music and road conditions with FM radio while riding. | Advanced Noise Reduction Technology: With improved CVC noise cancellation technology, it reduces surrounding wind and background noise. You are allowed to enjoy Bluetooth stereo voice with high definition sound quality during riding at a high speed. | Large Battery Capacity: V4 Plus motorcycle helmet Bluetooth headset runs on a 750mAh large rechargeable battery. With just 2 hours of charging, the intercom working time can reach 18hours and the standby time can reach 150hours, suitable for long-time riding. | Waterproof and Compatibility: With IP65 waterproof, the headset could handle almost all weather conditions. It is compatible with full-face helmet, 3/4 helmet, flip-up helmet and most half-face helmets which can cover ears. The motorcycle helmet Bluetooth headset can withstand 14℉ to 122℉ and can be used in most countries and regions.