Features:
1. 40mm drive unit， high fidelity， it could produce more dynamic bass， rich immersive sound， put you personally into music.
2. Bluetooth 4.0 version， wide compatibility， it could build more faster connection and transmit stable signal in high speed.
3. Built-in durable battery， 250mAh， only need 1-2 hours for full-charged， and it support approximately 5 hours working time.
4. TF card， this headphone support TF card within 16GB， besides， it also could be connected by 3.5mm audio cable.
5. FM radio function， provide you another way of entertainment， the FM frequency is from 87.0-108MHz.
6. Adustable headband and soft earmuffs， more comfortable， you would not feel any pain after long-time wearing.
Specifications:
| General Specification | |
| Brand | JKR |
| Model | 211B |
| Color | Black， White |
| Wearing Type | Headband |
| Technical Parameters | |
| Microphone | Yes |
| Bluetooth Version | V4.0 |
| Transmission Distance | 10m |
| Receive Sensitivity | 90dB |
| Impedance | 32Ω |
| Frequency Response | 20-20kHz |
| Battery Capacity | 250mAh， 3.7V |
| Charging Time (h) | Approx. 1-2h |
| Working Time (h) | Approx. 5h |
| Standby Time (h) | Approx. 250h |
Package Included:
 | 1* JKR 211B Bluetooth Headphone |
| 1* USB Cable | |
| 1* Audio Cable | |
| 1* Manual |