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Sennheiser HD 4.40 BT Wireless BT 4.0 25hrs Black
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Sennheiser HD 4.40 BT 4.0 25 Black
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Technical Specifications
| 3.5mm Connector | 1 mm | 1 mm | |
| Acoustic System Name | Closed Back | Closed Back | |
| Battery Life (max) | 25 hours | 25 hours | |
| Battery Recharge Time | 2 hours | - | |
| Battery Technology | Lithium Polymer (LiPo) | Lithium Polymer (LiPo) | |
| Battery Type | Built-in battery | - | |
| Battery Voltage | 3.7 V | - | |
| Bluetooth | Yes | Yes | |
| Bluetooth Profiles | A2DP, aptX, AVRCP, HFP, HSP | APT-X | |
| Bluetooth Version | 4.0 | 4.0 | |
| Cable Length | 1.4 m | 1.4 m | |
| Cables Included | Audio (3.5mm), Micro-USB | Audio (3.5mm), USB | |
| Carrying Case | Yes | Yes | |
| Charging Source | USB | - | |
| Colour of Product | Black | Black | |
| Connectivity Technology | Wired & Wireless | Wired & Wireless | |
| Connector Contacts Plating | Gold | - | |
| Detachable Cable | Yes | Yes | |
| Driver Type | Dynamic | - | |
| Ear Coupling | Over-ear | Over-ear | |
| Ear Coupling - Over-ear | Yes | Yes | |
| Foldable | Yes | Yes | |
| Headphone Frequency | 18 - 22000 Hz | 18 - 22000 Hz | |
| Headphone or Headset | Mobile headset | Mobile headset | |
| Headphone Sensitivity | 113 dB | 113 dB | |
| Headset Type | Dual Ear | Dual-ear | |
| Impedance | 18 Ω (Ohms) | 18 Ω (Ohms) | |
| LED Indicators | Yes | Yes | |
| Microphone Frequency | 100 - 10000 Hz | 100 - 10000 Hz | |
| Microphone Number | 2 | 2 | |
| Multi-function Control - Position | On-ear | On-ear | |
| Multi-function Control - Type | Digital | Digital | |
| Multi-function Control Present | Yes | Yes | |
| NFC / W1 | Yes | Yes | |
| Rechargeable | Yes | - | |
| Sound Pressure Level (Max) | - | 113 dB | |
| Storage Pouch | - | Yes | |
| USB Connectivity | Yes | Yes | |
| USB Port - Micro | Yes | Yes | |
| USB Port - Type | Micro | Micro | |
| Volume Control Present | Yes | Yes | |
| Volume Control Type | Digital | Digital | |
| Wearing Style | Head-band | Head-band | |
| Weight | 225 g | 225 g | |
| Wireless Range | 10 m | - | |
| Wireless Type | Bluetooth | Bluetooth |
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