Casque Defender FreeMotion B540

The Defender FreeMotion B540 is a wireless Bluetooth headset designed for calls and music. It features supra-aural ear coupling, a foldable head-band construction with a metal headband base, soft protein-foam ear pads and a compact lightweight design weighing 200 g in black finish. Connectivity options include Bluetooth wireless operation with up to 10 m range, a MicroSD card slot to play MP3 files directly from a memory card, built-in FM receiver and a 3.5 mm audio cable for wired use when the battery is discharged. On-earcup controls and a built-in microphone allow hands-free calling and simple track or volume control.

Advantages

The headset combines wireless Bluetooth convenience with alternative playback options: MicroSD card support, FM radio and a wired audio connection. Foldable construction and an adjustable headband make it portable and adaptable, while soft protein-foam ear pads and a metal reinforcement in the headband deliver a balance of comfort and durability. Built-in microphone and on-earcup controls provide straightforward call handling and media control without needing to access a phone.

Suitable for

• Wireless phone calls and video conferences
• Listening to music from a smartphone, laptop or MicroSD card
• Indoor use while moving around within up to 10 m from the source
• Travel and commuting where a compact foldable headset is required

Key specifications

• Connectivity: Bluetooth wireless with up to 10 m operating range; 3.5 mm wired input
• Frequency response: 20–20,000 Hz
• Weight: 0.2 kg
• Ear coupling: Supra-aural (on-ear)
• Wearing style: Head-band, adjustable
• Playback options: MicroSD card slot and built-in FM receiver
• Controls: Buttons on earcups for calls and media control
• Battery life: up to 10 hours of operation
• Construction: Compact foldable design with metal headband base and protein-foam ear pads

How to use

Charge the headset before first use following the supplied charging cable instructions. For Bluetooth operation, enable Bluetooth on your phone or laptop and select the headset from the device list to pair. Insert a MicroSD card to play stored MP3 files directly or switch to FM mode to listen to radio stations. Use the controls on the earcups to answer calls, play/pause or skip tracks and adjust volume. If the battery is discharged, connect the included audio cable to the headset and source device to continue listening in wired mode.

Recommendations

For stable wireless performance keep the paired device within 10 m and avoid obstacles that heavily block signal line-of-sight. Regularly clean ear pads with a dry cloth and avoid exposing the headset to moisture. For longer battery life, switch off the headset when not in use and charge using the original cable following manufacturer guidelines.