1. BASIC PARAMETERS: Our headset supports memory cards up to 32GB (without ) and supports playing music files in MP3 format. Songs can be played and enjoyed at any time. 2. LONG BATTERY LIFE - The 400mah large capacity lithium battery plays continuously for about 4-6 hours. 3. EASY TO CARRY: Foldable design for easy inclusion in the bag. Enjoy music anytime and anywhere. 4. PLASTIC CASE: Premium plastic material for the earphone shell, strong and sturdy, wear-resistant and scratch-resistant, ensure a long service life. 5. IDEAL GIFT: This headset is an ideal gift for your friends or family, especially for music lovers, a very thoughtful gift! Specification: Item Type:Wireless Earbuds Case material: plastic. Product battery: 3.7V 400mAh lithium battery (built-in) Package includes: 1 x Earphone. 1 x charging cable. 1 x Manual