"These Bluetooth earphones have excellent sound quality, they are small, light and durable. Synchronization with your phone is very fast and can even be done with one earphone (or both). Its very compact case with magnetic closure recharges and protects your headphones, it is easy to carry. The charging of headphones is also magnetic, your headphones have no risk of falling. They are used both for listening to music and making calls. These headphones are ideal in all circumstances! Technical data: - Bluetooth version: 4.2 - Input: DC 5V - Battery capacity of the case: 3.7 V / 60 mAh - Approximate charging time: 40 mins - Frequency response: 20-20000 Hz Included in the packaging: Wireless Earphones + Charging cable + User manual."