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Why choose iTechShop wireless earbuds? Upgraded Bluetooth 5.0 Stereo Sound Quality with Deep Bass STABLE CONNECTIVITY- Never disconnect during use LONGER BATTERY LIFE-Up to 24 Hours Supports both earbuds for phone calls. 30 DAYS NO REASON MOENY-BACK GUARANTEE Feature: Bluetooth version: Bluetooth 5.0 Working distance: ?10M Headphone battery capacity: 55mAh Charging box battery capacity: 500mAh Headphone Charging time: about 1 hours Charging box charging time: about 1.5 hours User Tips: In Stereo Mode, when you use it as a pair, both earbuds can control the media (such as Play/Pause, recall and so on) from its own button. Please be informed that you can only hear the voice from one earbud when you are in a call in Stereo Mode. Twins and Single Method(Reset, to solve bluetooth connection problems): NOTE: when to pair, please pair the 2 earbuds first then to your Bluetooth devices Wireless Pairing Steps (Both earbuds used at the same time) Twins Pairing: 1. Long press the power button of the pair of earphones at the same time until the led flash in blue and red alternately. 2. Then double click EITHER side to enter pairing mode,or press the button for 3 seconds,there would be reminding voice"ready to pair". 3. Turn on the Bluetooth on your device and search "Bluetooth" to connect.When the led flash slowly in blue,they pair successfully. Single Pairing: 1. Long press the power button of the earphone until the led flash in blue and red alternately, then it is ready to pair. 2. Please turn on the “Bluetooth” on your cellphone and choose “bluetooth ” on your list, there would be reminding voice from the earphone saying “pairing success”.