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STERIO TRUE WIRELESS BLUETOOTH EARBUDS (New Version 20181017)IMPORTANT NOTE*Please read the user guide carefully before use. *Please replace the ear tips in the package if the original ones are not suitable for you ears, and make sure these earbuds are inside in your ear canals, or you will hear low sound even though they are at highest volume. NOTE: This product DOES NOT support volume adjustment. *Reboot the headsets when the touch button doesn't work occasionally. *The eartips on the headsets may have white dust on them. This is the packing material and it adhears to the silicone eartips in the transportation. Don't worry that they are not used headsets. *The micro USB interface doesn't completely fits with the earbud's charging slot and this is not defective item. Do not move the headsets when they are charging in case of the charging slot being damagedProduct Specifications*Model:STR109A*Weight: 0.34oz x 2 (9.7g x 2)*Size: 2.1" x 1.4" (5.5 x 3.5 cm)*Bluetooth Version: Bluetooth V4.2*Operating Distance: 32.8 feet (10m)*Battery Type: Polymer Lithium-ion (90mAh) x 2*Battery Life: Music placyback/Talk time 4.5 hours at 50% volume*Standby time: 60 hours*Charging time: 1.5 hours *Support Profile: HFP, A2DP and AVRCP*Sensitivity: 93±3dBWhat's In The Box*STERIO Truly Wireless Bluetooth Headsets (Left & Right)*Carrying Case (PU material)*Universal USB Charging Cable with 2 Ports (Mirco USB)*4 Pairs of Eartips (one of them is on the headsets)*User GuideNote: Charger is NOT INCLUDED.Please watch the videos about how to use of the STR109A earbuds. 1. How to Pair/Connect https://youtu.be/OxkUVny2D0w 2. How to Fix The Problem About The Two Earbuds Not Connecting With Each Other https://youtu.be/yTrvHbNz_d0