Low battery backup is the only problem. but working extremely fine. features are as under:-

Active Noise Cancellation: Up to 40 dB noise cancelling with 2 modes - Faint (+/- 25dB) & Extreme (+/- 40 dB) through manual adjustment via OnePlus mobile or HeyMelody App.
High Quality Sound: 11mm dynamic drivers acoustically tuned for bigger, bolder beats with razor-sharp treble & Dolby atmos support delivers immersive, true-to-life sound using industry leading spatial audio. Supported Audio Format(s): SBC, AAC
3-MIC ENC Call Noise Reduction: To keep your calls sounding smooth, the 3-MIC design trims down wind noise caused by air friction. It sharpens voice-pickup & cuts down surrounding noise for crystal clear speech.
Worry-free Battery Life: Enjoy up to 38 hours of music and a quick fast charging of 10 minutes for 5 hours of playtime.; Built for Mobile Gaming: Your winning advantage starts here with latency as low as 94ms, with Pro Gaming mode activated
Battery Average Life: 7.0Hours; Control Type: Call Control; Model: E504a