Mention: TWS TECHNOLOGY make wireless synchronous connection stereo pairing come true. Without any cord troubles you can enjoy sports and music to the full. It has privacy call design, when you have hands-free calls only the main headphone (Left) can transfer voice signal. Package Included: 1* Dual Bluetooth Earphones 1* Charging Box with Cable 1* Storage Bag 2* Replaceable Earplug 1* Manual Features: 1. Mini two-in-one stereo Bluetooth headset with mobile power, long standby. 2. Built-in 400mAh emergency mobile power. 3. Low power consumption, super compatibility. 4. Support microphone call hands-free function. 5. Optimized circuit design, product has over-current protection, short-circuit protection, does not hurt the equipment General Specification: Model Number: X18S TWS Color: Gold;White;Black Optional Version: Dual earphones with charging case Wearing Type: In-ear Earphone Weight: 4g * 2 Dimensions of Charging Box: 30*51*95mm Dimensions of Earphone: 16*26mm Technical Parameters: Microphone: Yes Voice Prompt: Support Receiving Calls: Yes Noise Reduction: Yes TF Card: Support Bluetooth Version: 4.2 Languages: English Transmission Distance: 6-10m(according to the using environment) Support Protocol: Headset/handsfree/A2DP/HFP/HSP/AVRCP Capacity: 400mAh(Charging box), 60mAh(Dual earbud) Music Time: 2.5 hours (Laboratory Test Time) Talking Time: 3 hours (Laboratory Test Time) Standby Time: 84 hours Functions: Waterproof,Dual earbuds,Stereo,Long working life. How to use TWS Earbuds 1. Please earbuds for 3s till blue light flash, 2. Then Search for the Bluetooth name "K9" in the device list. 3. When the pairing is successful, you will hear the ear voice prompt "pairing successful,Second Device Connected".