I bought the cheapest possible earbuds and of course… what you pay for is what you get. Specifications: Bluetooth version: 5.0 Transmission distance: outdoor straight line distance 10-18 meters Battery capacity: polymer lithium battery 45 mAh Charging box battery capacity: 400 mAh Listening to music time: 1.5 - 2 hours Up Playing time: 2 hours Standby time: 100 hours Charging time: 1 - 2 hours Working current: 22 mA Standby current: 4 uA Price: $4.