Speaker diameter: 40 mm
Neodymium magnet
Coil: CCAW
Frequency response: 20Hz ~ 20kHz
Impedance: 32 Ohm +/- 15%
S / N ratio:> = 58 dB
THD: <1% (1kHz)
SPL (Sound pressure level): 96 dB +/- 3 dB
Nominal input power: 60 mW
Maximum input power: 100 mW
Bluetooth: 4.1
Bluetooth range: up to 10 m
Bluetooth profiles: HSP, HFP, A2PD, AVRCP
Supported Codecs: AAC
Built-in microphone: electret condenser
Mic sensitivity: -42 dB +/- 3dB
Voice call handling
Music playback time: up to 4.5 hours
Talk time: up to 6 hours
Standby time: up to 300 hours
Ports: AUX (3.5 mm), micro USB (charging)
Battery capacity: 250 mAh
Power supply: 5V, 150mA
Wood: walnut
Included: AUX cable, USB cable
Plug: 3.5 mm, gold-plated
Cable: 120 cm, TPE

Forget tangling cables! The Kruger & Matz KM 665BT headphones are equipped with a Bluetooth module, thanks to which you can listen to music wirelessly. Another advantage is the built-in microphone, which will allow you to conveniently make phone calls.
The Kruger & Matz KM 665BT headphones are synonymous with great sound. And all thanks to perfectly tuned speakers that provide strong, deep bass and clear sopranos. Very comfortable, thick earmuffs made of eco-leather help to isolate from external noise
Are you looking for headphones that will emphasize your individual style? The KM 665BT headphones are a perfect proposition for you, because they are characterized by the perfect design typical for Kruger & Matz. The housing of the headphones is made of natural walnut wood, so you can be sure that each pair is unique
Amazing sound and phenomenal appearance are not the only advantages of the KM 665BT headphones. In order for the pleasure of using them to last as long as possible, a very comfortable and durable case is included in the set. It will not only facilitate transport, but also protect the headphones from possible damage.