At CES 2017, Sennheiser announced the addition of two Bluetooth headphones to the HD 4 Series. The HD 4.50BTNC ($199.95, shown here) and the HD 4.40BT ($149.95) are closed-back, over-the-ear headphones using 32mm drivers and incorporating Bluetooth 4.0 with aptX and NFC pairing. The HD 4.50BTNC adds the company's NoiseGard active noise cancellation. Sennheiser rates the battery life at up to 25 hours, or 19 hours with noise cancellation engaged. The HD 4.40BT will be available this month, and the HD 4.50BTNC will be available in February.

From Sennheiser
Sennheiser is launching the HD 4.50BTNC and HD 4.40BT-two new wireless headsets for brilliant, everyday listening pleasure. The first Bluetooth models in the audio specialist's popular HD 4 series combine high-quality Sennheiser sound with the freedom of wireless listening in a robust, affordable headphone. The HD 4.50BTNC additionally features Sennheiser's NoiseGard active noise cancellation for a listening experience free from any distractions.

The closed back, around-ear headphones have been created to be perfect everyday companions for wireless listening on the move. "The HD 4.50BTNC and HD 4.40BT are designed for always-on, always-connected customers for whom the enjoyment of media and music can be part of every day and every hour," explains Ivan Kuan, Head of Portfolio Management Lifestyle at Sennheiser.

Thanks to Sennheiser's NoiseGard active noise cancellation technology, users can enjoy music without any distractions with the HD 4.50BTNC: By intelligently filtering out ambient noise, this system lets the detailed acoustic response of the proprietary Sennheiser 32mm drivers shine.

Both the HD 4.50BTNC and HD 4.40BT employ the advanced wireless technology and audio codec of Bluetooth 4.0 and aptX to deliver true wireless Hi-Fi sound. Alongside great performance, the new headsets offer ease of use, comfort and convenience. They feature NFC for simple pairing with compatible devices and intuitive ear-cup mounted controls for changing tracks and for making calls via the integrated microphone. Wearing comfort is assured by their ergonomically designed ear pads.

The HD 4.50BTNC and HD 4.40BT feature excellent battery life, letting listeners enjoy wireless sound for up to 25 hours. With ANC enabled, the HD 4.50BTNC still allows for up to 19 hours of wireless, distraction-free listening. A battery-free listening mode is also possible via a supplied detachable cable.
Elegant and minimalistic, the new wireless headphones have been crafted from durable materials that make them tough enough to be everyday audio companions. With their collapsible design, the HD 4.50BTNC and HD 4.40BT fold away compactly. For easy storage, the HD 4.50BTNC comes with a protective case, while the HD 4.40BT can be stored in the supplied soft pouch.

The new HD 4.40BT will be available from January 2017, while the HD 4.50BTNC will be available from February.

Additional Resources
• Sennheiser Debuts New HD 500 Headphone Series at HomeTheaterReview.com.
• Sennheiser Introduces PXC 500 Wireless Headphones at HometheaterReview.com.