Description Bluetooth Chip: V4.2 CSR64110 ---- Chips UK CSR (Cambridge Silicon Radio), Stable Connect. Stylish and Innovative Lipstick Portable Charging System. 2 in 1 Bluetooth headset and emergency power bank, required for driving / working, indoor and outdoor sports. CVC noise isolation technology reduces the external noises, activate clear microphone sound. The power bank for safety emergency charging, 850 mAh large battery can keep working for 100 hours. Built-in Mic / Handsfree call .. it is very useful to make a phone call while driving. The real wireless, connect the same headset and double. to share music with your friends. All compatible, can also work with Android phone and iPhone. Some Specification Bluetooth Profiles: HSP, HFP, A2DP and AVRCP Transmission range: 10 m Material: aluminum alloy, plastic, silica gel Certification: CE, FCC, ROHS, Earphone battery: 45mAh-4 hours working time Power bank battery: 850mAh-100 hours working time Earphone size: 20mm * 16mm * 25mm General body size: 20mm * 20mm * 100mm Overall body weight: 48.3 grams, headphone weight: 5.9 grams, Packing list: 2 * TWS bluetooth headset 1 * USB Charging Cable 1 * User's Manual 4 * Ear cap B luetooth Matching (dual headset): Turn on both the left and right earphones, and the need for two headphones to make the automatic intercom for 1 to 3 seconds. (the red light flashes twice, then the blue light flashes once) Press the right earpiece (logo "R") until you flash the red and blue lights (flip status), then turn on your phone's bluetooth, the search should be paired with "S2" and click. (if you do so, you'll see that the phone successfully flashes the blue lights, or you will hear the voice "paired phone") If there is no matching name in your cell phone bluetooth memory, please according to "S2", step1 and re-step2.