Features:
* Portable design， with a metal hook， can hang on your backpack， bike， so on.
* Waterproof IPX4 level， still can enjoy the rain in bad weather.
* Built-in NFC function， touch lightly and fast connection.
* With a clear microphone， enjoy a hands-free call.
* AUX-in connection， multi way to listen to music.
* Button control， adjust the volume and songs freely.
Specifications:
| General Specification | |
| Brand Name | NILLKIN |
| Model Number | S1 |
| Optiona Color | Black， Green， Red， Blue |
| Net Weight (g) | 200g |
| Dimensions (cm) | 10.05*9.3*4.35mm |
| Technical Parameters | |
| Microphone | Yes |
| Connectivity | Bluetooth， NFC， AUX-in |
| Bluetooth Version | Bluetooth CSR4.0 |
| Transmission Distance | ≤10m |
| Rated Power | 3W |
| Speaker Specification | 42mm 4Ω 3W |
| Bluetooth Mode | A2DP/AVRCP/HFP/HSP |
| Audio Format | MP3/WMA/WAV/FLAC/APE |
| Channel System | Single Chaneel |
| SNR | ≥75dB |
| Distortion | ≤1% |
| AUX | 3.5mm audio port |
| Power Input | 5V/500mA |
| Power Interface | USB micro |
| Frequency Range | 2.24GHz-2.48GHz |
| Frequency Response | 80Hz-20kHz |
| Battery Capacity | 800mAh |
| Working Time (h) | ≥5H(depends on volume and audio content) |
Package Included:
 | 1* NILLKIN S1 Bluetooth Speaker |
| 1* AUX Cable | |
| 1* Portable Hook | |
| 1* USB Cable | |
| 1* Sucker | |
| 1* User Manual |