Lexin B4FM Pro: Group Riding Intercom with Up to 15 Hours of Battery Life

The Lexin B4FM Pro is a motorcycle intercom that can connect up to 10 units and offers up to 15 hours of active use on a single charge. Compared with the B4FM, it adds Bluetooth 5.0, USB-C and other features for communication and listening to audio on the road.

Bluetooth and music sharing

The intercom uses Bluetooth 5.0 for wireless connections. Music can be shared between two Lexin B4FM Pro units, allowing riders to listen together. The device also has an FM radio for listening to stations without another connected device.

A USB-C port is used for charging. The connector can be plugged in either way up, making it easier to handle.

Battery and charging

The built-in battery has a capacity of 800 mAh. It provides up to 15 hours of active use or up to 350 hours in standby. When planning a longer trip, it is useful to distinguish between the two: standby time is not the same as active communication time.

Charging the battery via USB-C takes approximately 2.5 hours. This is worth considering when planning breaks or preparing for another full day of riding.

Communication and sound quality

Full duplex lets participants speak and listen at the same time, much like a normal phone conversation. For group rides, up to 10 units can be connected, allowing riders to stay in touch and share information about the route or planned stops.

The intercom uses DSP and CVC technologies to reduce background noise. These help limit distracting sounds during conversations, such as wind or noise from the surrounding environment, but they do not eliminate noise completely. According to the manufacturer, communication remains intelligible at speeds of up to 120 km/h (about 75 mph). Quality can vary depending on riding conditions.

IP67 protection

An IP67 rating indicates that the device is dust-tight and protected against temporary immersion in water under standardized conditions. In everyday use, this is particularly useful in rain or dusty environments. The rating does not, however, guarantee uninterrupted communication or unlimited protection from damage.

The Lexin B4FM Pro is a practical option for riders who want group communication alongside music sharing and FM radio. For longer trips, the stated battery life and charging time are particularly important considerations.