Parameters：

BT Version: V5.3
Wireless Range: 10m
Battery Capacity: 350mAh
Play Time: Up to 50 hours
Input: Type-C

Features：

Up to 50-hr Playtime--Jam to Music All Day and Night
Necklace 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 Flash
Just 10-min fast charging can provide 10-hr music listening, making you music play on and on.

Noise Cancellation in Calls--Designed for Clear Calls
Necklace 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 Switch
Each 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 earbuds
Power off: Clip the magnetic earbuds on

Dual EQ--Switch As You Like
Short press the Mode button "M" once to switch between Normal Mode and HavyBass™ Mode.

HavyBass™ 2.0--Unrivalled Deep Bass
The 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 Game
Game mode provides fluent experience while playing video or games, helping you capture your best gaming moments.

Dual Device Connection--Freely Switch to the Other Devices
Necklace 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 Sweat
Featured 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.