USA 
CX 400BT True Wireless In-Ear Headphones (White)
Product Description
Take control of your wireless audio experience with the CX 400BT True Wireless In-Ear Headphones from Sennheiser. Utilizing the Sennheiser Smart Control app for iOS and Android devices, you can fully customize the functionality of the CX 400BT's integrated touch controls. Both earbuds feature touch controls and you can set what a single, double, or triple tap does, as well as what happens when you tap and hold the side of the earbud. Options include music management functions and engaging your phone's digital assistant software.
Sennheiser engineered the CX 400BT headphones to ensure what you play through them sounds as good as possible. Featuring 7mm dynamic drivers and support for multiple codecs, including aptX. With dual integrated MEMS microphones, these true wireless headphones can be used for more than music. Pair them with a smartphone for hands-free wireless calls or give voice commands to your phone's digital assistant. Music, calls, and more can be enjoyed for up to 7 hours on a full charge, with an extra 13 hours provided by the included charging case.
Sennheiser engineered the CX 400BT headphones to ensure what you play through them sounds as good as possible. Featuring 7mm dynamic drivers and support for multiple codecs, including aptX. With dual integrated MEMS microphones, these true wireless headphones can be used for more than music. Pair them with a smartphone for hands-free wireless calls or give voice commands to your phone's digital assistant. Music, calls, and more can be enjoyed for up to 7 hours on a full charge, with an extra 13 hours provided by the included charging case.
| Item Type | |
| Number of Included Headphones/Receivers | |
| Number of Included Transmitters | |
| Number of Included Headsets | |
| Number of Included Transceivers | |
| Headphone | |
| Earpiece Design | In-Ear (Intra-Aural), Closed-Back |
| Earpiece Swivel | |
| Earpiece Connection / Wearing Style | |
| Foldable | |
| Number of Earpieces | |
| Sound Field | |
| Earpad Size | |
| Driver Type | Dynamic |
| Number of Drivers | 1, per Earpiece |
| Driver Size | 0.28" / 7 mm |
| Diaphragm | |
| Magnet Type | |
| Voice Coil | |
| Impedance | |
| Active Noise Cancellation | No |
| Controls/Microphone Location | Controls: Left Earpiece, Right Earpiece Microphone: Left Earpiece, Right Earpiece |
| Full Remote OS Support | Not Specified by Manufacturer |
| Sensors | Touch |
| Contact Pressure | |
| Performance | |
| Frequency Response | 5 Hz to 21 kHz (Wireless) |
| Resonant Frequency | |
| Sensitivity | |
| Matching Tolerance | |
| Maximum Sound Pressure Level (SPL) | 114 dB at 1 kHz |
| Maximum Power Handling | |
| Functional Bias Voltage | |
| Electrostatic Capacitance | |
| Output Power | |
| Volume Limiting | |
| Noise Attenuation | |
| Total Harmonic Distortion (THD) | 0.08% |
| SNR | |
| CMRR | |
| Channel Separation | |
| Storage Capacity | |
| Microphone | |
| Number of Mics | 2 |
| Beamforming Support | Yes |
| Type | MEMS |
| Diaphragm Size | |
| Mic Boom Location | |
| Pickup Pattern | |
| Noise Canceling | |
| Frequency Response | 100 Hz to 10 kHz |
| Operating Voltage | |
| Sensitivity | |
| Maximum SPL | |
| Impedance | |
| SNR | |
| Distortion | |
| Equivalent Noise Level | |
| Wireless Connectivity | |
| Wireless Transmission | |
| Number of RF Channels | |
| RF Bandwidth | |
| Max Systems per Setup | |
| Wireless Modulation | Bluetooth: π/4 DQPSK, 8DPSK, GFSK |
| DECT Standard | |
| Duplex Mode | |
| RF Channel Access Method | |
| Latency | |
| Speech Encoding | |
| Transmission Speed | |
| Approximate RF Sensitivity | |
| Supported Audio Codecs | AAC, SBC, aptX |
| Bluetooth Profiles | |
| Bluetooth | 5.1 |
| Bluetooth Power Class | 1 |
| Wireless Range | |
| Frequency | Bluetooth: 2.4 GHz (2.402 to 2.48 MHz) |
| Transmitter Power | 10 mW |
| Multipoint Support | No |
| Maximum Paired Devices | |
| NFC | No |
| Wireless Chipset | |
| Transmitter Host Connection | |
| Encryption | |
| Audio Connector to Source | |
| Connector Plating | |
| Adapter (Included) | |
| Cable Design | |
| Audio Connector to Earpiece | |
| Cable Length | |
| Cable Length | |
| Cable Color | |
| Cable Conductor Material | |
| Battery | |
| Battery Type | |
| Battery Type | |
| Battery Chemistry | Lithium-Ion |
| Battery Chemistry | |
| Capacity (mAh) | 55 mAh (Left Earpiece) 55 mAh (Right Earpiece) |
| Runtime | 7 Hours (BT) |
| Runtime | |
| Quick Charging Times | 10 Minutes for 1 Hour |
| Recharge Time | 1.5 Hours |
| DC Input Power | 5 VDC at 650 mA |
| Wireless Charging | |
| Charging Port | Pins |
| Charging Cable Length | 9.8" / 25 cm |
| Number of Channels | |
| Users per System | |
| I/O Connectors | |
| Antenna | |
| Audio Decoding | |
| Number of Charging Ports | |
| AC/DC Power Adapter | |
| AC Input Power | |
| Power Consumption | |
| Charging Case | |
| Additional Runtime | 13 Hours |
| Battery Chemistry | Lithium-Ion |
| Capacity | 420 mAh |
| Charging Time | |
| Charging Interface | USB Type-C |
| Platform Support | |
| OS Compatibility | |
| Required Hardware | |
| Internet Connection | |
| Environmental | |
| Charging Temperature | |
| Operating Temperature | 32 to 104°F / 0 to 40°C |
| Storage Temperature | -13 to 158°F / -25 to 70°C |
| Operating Humidity | 10 to 80% |
| Storage Humidity | 10 to 90% |
| Certifications | |
| Physical | |
| Color | |
| Water Resistance | |
| IP Rating | |
| LED Indicator | |
| Material of Construction | |
| Dimensions | Headphones: 1.05 x 0.92 x 0.87" / 26.6 x 23.3 x 22.2 mm (Each) Charging Case: 2.32 x 1.67 x 1.33" / 59 x 42.3 x 33.8 mm |
| Weight | Headphones: 0.2 oz / 6 g (Each) Charging Case: 1.3 oz / 37 g |
| Warranty Length | Limited 2-Year Warranty |