Features: brand new and high quality Ultra-low power consumption, 40 mA battery, 4 hours of continuous operation. Free switching, one of the earbuds can be in operation while the other one is powered off. Super strong signal, stable connection, enabling enjoy music in various circumstances. Hifi sound effect ensures smooth and stable handfree phone communication. Automatically pairing and easy application. Specifications: Material: ABS+PCABS+Galvanization+Food Grade Silicone Bluetooth-compatible Version: 5.0 Transmission Distance: About 10 Meters/32.80 ft Approx. (under Barrier-free Environment) Earphone Working Time: About 15 Hours Headphone Standby Time: About 120 Hours Charging for Time of Single Earbud: About 35 Minutes Charging for Time of Charging Case: About 1 Hour Earbud Size: 39mmx18mm/1.53x0.70 inches Approx. Charging Box Size: 53mmx55mmx30mm/2.08x2.16x1.18 inches Approx. Package Includes: 1 Set of Earbuds note: Due to the difference between different monitors, the pictures may not reflect the actual color of the item. Compare the detail sizes with yours, please allow 1-3cm error, due to manual measurement.