Key Futures Upgraded 4 Riders Group Intercom V4 Plus Bluetooth Intercom allows you to connect 4 riders meanwhile for conference intercom, total range up to 1500 meters CVC Noise Reduction Technology CVC is a sort of software noise reduction technology. The principle is to reduce the noise through its build-in software and microphone, further eliminating some kinds of reverberation noise. Bluetooth Version 5.1 Steady data transmission and premium performance. The advanced Bluetooth chip with optimized Bluetooth version 5.1 dramatically increase the transmission rate and while keep the low-energy consumption. Voice Assistant There’s no need to bring out your phone, just talk directly to the microphone to awaken your voice assistant. Waterproof IP65 High-degree waterproof, freely used on rainy days. Specification: Bluetooth version: Bluetooth V5.1 Battery Capacity:750mAh Working time: 24 hours Charging time: 2 hours Standby time: 150 hours Waterproof Level: IP65 FM Radio: Yes Wireless transmission range: 1500m