Headset DEFENDER FreeMotion B400 — wired & wireless, USB-C, AUX, closed supraaural headphones, 20–20000 Hz, 118 dB, LED backlight, black

The Defender FreeMotion B400 is a compact, foldable wireless Bluetooth headset with wired connectivity via included audio cable and USB Type-C charging. It features LED backlit earcups, a built-in microphone for clear voice transmission, a MicroSD card slot for standalone MP3 playback and a lightweight supra-aural design with an adjustable headband. Battery life reaches up to 32 hours without backlight; actual runtime depends on volume, listening mode and conditions. The headset supports hands-free calls and music playback with a wireless range up to 15 m and weighs 220 g.

Advantages

Foldable construction and light weight make the headphones easy to carry and store. LED backlight on the earcups can be switched off by double-clicking the M/EQ button. Built-in microphone and on-earcup controls allow answering calls and changing tracks without handling your phone. The MicroSD slot converts the headset into an MP3 player for offline listening, and the included audio cable enables wired use when the battery is discharged.

Suitable for

• Everyday music listening and internet radio
• Hands-free phone calls and voice communication
• Travel and commuting thanks to foldable design
• Listening without a smartphone using MicroSD cards
• Use with laptops or devices via wired connection when needed

Key specifications

• Model: Defender FreeMotion B400 (MPN 63400, EAN 4745090824162)
• Connectivity: Bluetooth and wired (audio cable included), USB Type-C charging
• Frequency range: 20–20,000 Hz
• Wireless range: up to 15 m
• Battery life: up to 32 hours (without backlight)
• Weight: 220 g
• Ear coupling: supra-aural; wearing style: head-band
• Color: Black

How to use

Power on the headset and pair it with your Bluetooth device following standard pairing procedures. Use the on-earcup controls to play/pause music, skip tracks and answer or end calls. To play music from a MicroSD card, insert a supported MicroSD card into the slot and use the controls to navigate tracks. If the battery is low, connect the provided audio cable between the headset and your device for wired listening or recharge via the USB Type-C port.

Recommendations

For optimal battery life, disable LED backlight by double-clicking the M/EQ button when backlight is not needed. Keep the headset within the specified wireless range and avoid prolonged exposure to high volume levels to preserve hearing and device performance.