Baseus A01 Wireless is built in 20-20000Hz Frequency Response. This Earphone provides 1.5 Hours Charging Time, Up to 10 Hours playing or talk time which is cool and portable. This A01 is wireless type earphone with Bluetooth V4.1 and also USB connectors. This earphone can be use in Mobile Phone, for Video Game, Hi-Fi Headphone, For iPod, Sport, Common Headphone. It is one kind on In-Ear type earphone with is built in Aluminum Alloy metarials. It takes 1.5 hours for charging with 55 mAh battery. It is also compitable with MP3, PC, Mobile phone, iPhone, Computer. This earphone is available in Black, Golden and White color in our stock.