Cara Set : 1. Before charging, you must turn off the Bluetooth headset. 2. Connect to the 5V/1A adapter or computer USB port and don't connect to the fast charger. 3. The red light of the Bluetooth earphone is is always bright, the USB power connection is successfully, the red light is extinguished, and the charging is completed. Operation Instructions: Boot/Shutdown: On/OFF Mode Switch: Short press M/QE key switch Bluetooth mode and card mode. Card mode: Card mode directly into the TF card ( not when inserted into the card case, the card mode is turned off by default). After inserted into the TF card you can short press the M/QE key for to mode switch. Wired Audio input mode: Off state, the insertion of the distribution of audio cable, you can enter the audio input mode. Previous song: Long press VOL- button 2 seconds Next song: Long press VOL+ button 2 seconds Volume+: Short press VOL+ button   Volume-: Short press VOL- button Pause/Play/Answer/Hang up: Short press the pause/phone button to pause/play music and answer the phone, long press the pause/phone button to rejest the call. Spesifikasi: 1. Bluetooth: V4.2, jarak efektif 15 meter 2. Baterai: 360 mA 3. Aksesoris: kotak warna, manual, kabel data pengisian 4. Warna: Hitam 5. Bahan: ABS 6. Mendukung kartu TF 7. Packing: kotak warna 8. Stereo Audio Transmission 9. Microphone : Yes 10. Sound principle: dynamic 11. Frequency response range: 20-20.000 (Hz) 12. Impedance: 32 (Ω) 13. Sensitivity: 104 (dB) 14. Distortion rate: 10 (%) 15. Horn diameter: 40 (Φmm) 16. Earplugs / earmuffs material: leather