Oraimo Necklace4 50-hr Playtime Neckband.

Up to 50-hr Playtime--Jam to Music All Day and NightNecklace 4 provides an ultra long music-listening experience. Up to 50-hour playtime allows you to charge your Necklace 4 once a week.
Charge 10 Mins, Play 10 Hours--Charge as A FlashJust 10-min fast charging can provide 10-hr music listening, making you music play on and on.
Noise Cancellation in Calls--Designed for Clear CallsNecklace 4 is featured with proprietary noise-cancelling algorithm and inline microphone, which helps reducing surrounding noise and providing clear voice in calls.
Magnetic Lock--Intelligent SwitchEach earbuds has a built-in magnet, allowing you to get away from tangle-free carrying, get easy storage, and make a intelligent switch.
Power on: Split the magnetic earbudsPower off: Clip the magnetic earbuds on
Dual EQ--Switch As You LikeShort press the Mode button "M" once to switch between Normal Mode and HavyBass™ Mode.
HavyBass™ 2.0--Unrivalled Deep BassThe 2nd generation HavyBass™ algorithm will provide you an extraordinary experience of thumping bass like never before!
Low-latency Game Mode--Audio and Video Sync in GameGame mode provides fluent experience while playing video or games, helping you capture your best gaming moments.
Dual Device Connection--Freely Switch to the Other DevicesNecklace can connect 2 devices at the same time. Never worry about missing the calls from another phone.
*Long press the button "O" and "+" at the same time for 2s to connect to the second device.
IPX5 Waterproof & Sweat Protection--Not Afraid of Water and SweatFeatured with IPX5 waterproof and inner sweat-resistant nano-coating, Necklace 4 is created to withstand the test of time, accompanying you through rain and workout time.