Welcome to e-SMART Product model: TWS-4 Bluetooth version: Dual-mode Bluetooth V 5.0, Ultra low power consumption Input: 5V-1A Charger case: 3.7V/ 450mAh Wireless Profile: A2DP1.3/ HFP1.6/ HSP1.2/ AVRCP1.6/ D11.3 Headphone battery: Internal 50mah rechargeable Li-ion battery Standby time: about 100 hours ifone earbud on, 60 hrs if both earbuds on Talk time: Using one earbud(5-6 hrs), Using both earbud(4-5 hrs) Listening to the song: 3-4 hrs Warranty: 1 month Pairing method * Single ear connection: Long press the multi-function button, release the button, at this time, red and blue lights alternately flashing, open the phone, bluetooth can search for connection. *Ears (TWS) and connection: long press the multifunction key two headset, and the double-click on either side of the multifunction key to enter the TWS pairing state, while the corresponding tone, when only the blue light flashes slowly when representing TWS connection. Warranty claim: - Both side shipping charges will be paid by buyer for any warranty claim. - 1 month warranty is only for earbud. Cables, lightning connector, slow charging is not covered. - Please keep the original box for warranty claim, no box no warranty. - warranty is according the warranty sticker on the earbud, warranty sticker broken means warranty VOID. What inside the box: 1 x pair of earbud 1 x charging compartment 1 x usb charging cable