The Green Lion Shadow Beats True Wireless Earbuds - Black offers a top-drawer performance and an eye-catching, sleek, modern design. Made from good ABS + TPE, they work on Bluetooth V5.4 for a very stable connection with a transmission distance of about 10m. The impedance of the earbuds is 32?; the sensitivity is rated at 88 dB. The speaker size is about 10mm and can produce quality sound within wide frequencies (20Hz to 20KHz). The earbuds can last for about 5 hours of playtime and use a 200mAh battery within the case with fast Type-C charging. Other functions include touch control, clear calls, voice assistant support, and three customizable faces. The chains come included with the earbuds as a bonus. Specification Material: ABS + TPE Case Battery: 200mAh Earbuds Battery: 30mAh Bluetooth: V5.4 Transmission Range: 10m Impedance: 32? Sensitivity: 88 dB Speaker: 10mm Frequency: 20Hz-20KHz Charging Port: Type-C Charging Time: 1.5 Hrs Playtime: 5 Hrs Standby Time: 150 Hrs Features Touch Control 5 HRS Playtime Hanging Chain Included 3 Custom Faces Clear Call Quality Voice Assistant Type-C Charging