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Sennheiser CX 400BT CX 400BT True Wireless In-Ear Headphones
Features
- In-ear earphones with 7mm dynamic drivers
- Frequency response: 5Hz–21KHz
- USB charging via the USB-C socket on the charging case
- Sensitivity: 107 dB SPL (1 kHz / 1 mW)
- Single earbud weight: 6g; charging case weight: 37g
General specs
- Brand: Sennheiser
- Model: CX 400BT
- Seller: Newegg
- ID: 9SIAD6HKH97611
- Brand: Sennheiser
- Model Name: CX 400BT
- Driver unit: 7mm dynamic driver
- Part Number: 508901
- Sensitivity: 107 dB SPL (1 kHz / 1 mW)
- Product Type: True wireless headphones
- Earphone Type: In-ear
- Charging Method: USB charging via USB-C socket at charging case
- Frequency Response: 5Hz-21KHz
- Weight of charging case: 37g
- Weight of single earbud: 6g
- First listed by seller: October 3, 2026
If you are interested in more details, you can find full information on the seller's page.
€157.56
Last price update: 10/7/26
Available to order
Price History for seller Newegg
| Date | Price |
|---|---|
| 10/7/26 | €157.56 |
| 10/3/26 | €161.79 |
Shipping options
Delivery to 
United States
United States
Available
True wireless in-ear headphones with 7mm dynamic drivers and a frequency response of 5Hz–21KHz. The charging case charges via its USB-C socket.
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| Brand | Sennheiser | Sennheiser | Sennheiser | HXSJ | Sennheiser | Sennheiser |
| Model | CX 400BT | CX200TW1 | Momentum True Wireless 4 | Air-S4 | HDB 630 | ACCENTUM True Wireless |
| Color |
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| Price | €157.56 | €66.84 | €267.49 | €18.10 | €445.85 | €196.15 |
| Seller | Newegg | Newegg | Newegg | Newegg | Newegg | Newegg |
| Update | Oct 17, 2026 | Oct 17, 2026 | Oct 17, 2026 | Oct 17, 2026 | Oct 17, 2026 | Oct 17, 2026 |
| Model Name | CX 400BT | CX200TW1 | Momentum True Wireless 4 | Air-S4 | HDB 630 | ACCENTUM True Wireless |
| Part Number | 508901 | CX200TW1 White | C16101V63=EDA002194301B | 6C-5E4P-A66A | 700263 | |
| Sensitivity | 107 dB SPL (1 kHz / 1 mW) | 110 dB SPL (1 kHz / 0 dBFS) | 105 dB (1 kHz / 0 dBFS) | 107dB S.P.L. at 1KHz | ||
| Product Type | True wireless headphones | True Wireless In-Ear Headphones | Wireless earbuds | true wireless earphones | Wireless over-ear headphones | True wireless earbuds |
| Frequency Response | 5Hz-21KHz | 5Hz-21KHz | 5Hz-21KHz | USB: 6 Hz–40 kHz only when using Line-In or USB (96 kHz), and Bluetooth with aptX adaptive (96 kHz); 6 Hz–22 kHz otherwise | 5Hz-21KHz | |
Sennheiser CX 400BT White In-ear earphones with 7mm dynamic drivers
€157.56
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