Bluetooth Wireless Earbuds with Volume Control, Dudios Bluetooth Earbuds 70 Hours Playtime, Semi-in-Ear Earbuds Binaural Built-in Mic Wireless Headphones, USB-C Charging Case for Android iPhone Music ‘Brand New’ Negotiable Unopened Pick Up. Bluetooth Chip RTL8763BFP PAU1606 RTL8763BFR RTL8763BFR CSR8645 RTL8763BFR Bluetooth Version Bluetooth 5.0 Bluetooth 5.0 Bluetooth 5.0 Bluetooth 5.0 Bluetooth 4.1 Bluetooth 5.0 Driver Diameter Φ14.2mm Φ6mm Φ6mm Φ6mm Φ10mm Φ6mm Waterproof Level IPX4 IPX4 IPX5 IPX4 IPX7 IPX4 Playtime Per Charge 4 hours 4.5 hours 4 hours 4 hours 16 hours 4 hours Total Playtime with Charging Case 70 hours 20 hours 24 hours 30 hours No Case 16 hours Control Type Touch Control Touch Control Touch Control Physical Button Physical Button Physical Button Charging Port USB-C Micro USB Micro USB Micro USB Micro USB Micro USB Additional Features With Volume Control;Loud Volume; With Mono & Stereo Mode; No Master Restriction;Can be used as a power bank With Mono & Stereo Mode; No Master Restriction Right earbud can be used separately; Exceptional Mid & Bass Sound Can Connect Both Features & details 【70H Playtime Wireless Headphones with Charging Case】 Dudios Dubuds wireless earbuds can play for 4 hours on a single charge, 2600mAh portable charging case can provides 20 full recharges, stay powered up on the go with a total playtime of 70 hours. They can be charged automatically only if you put them in the case. There are also LED indicators show you the battery remaining and earbuds charging status. 【No Master Restriction】Both wireless earbuds can be used as the master piece. Simply pick up either left/right earbud to enter mono mode, and pick up both to enter stereo mode. This design also ensures quick and better connection with your devices at any time. 【Individualized Fit】Latest Bluetooth 5.0 technology and RTL8763BFP high-end chip ensures Dudios bluetooth earbuds with stable connection and fast transmisson. Perfect for listening to music and hands-free phone call with built-in mic. #Kindly note that this model of true wireless earbuds without silicone eartips, please check the ear portion of the headphone carefully before purchase. 【One Step Pairing & Build-in Microphone Bluetooth Headphones】 Take both earbuds out of the charging case, you can seamlessly pair them to your Bluetooth devices automatically without any problem. With the built-in mic, you can answer your phone with double click on the multifunction button of either earbud. Tap MFB of your right earbud once to turn up volume, and tap the left once to turn down volume.