LED digital power display, the remaining power of the charging compartment is clear at a glance, avoiding the embarrassment of a sudden loss of power! The power of the left earphone, the total power of the charging compartment, and the total power of the right earphone are clearly visible. Applicable products: smart matching phones, tablets.Real Fast Charging for 48 hours Working Time. With the technology and large capacity battery our Bluetooth earbuds for a long time of working. USB Charging Cable. True Wireless Earbuds, Bluetooth v5.0, Fast Pairing; Smart touch control, 10m Wireless Connectivity Range, Hi-Fi Stereo Sound, Ergonomic & Lightweight, 40 Hours Playtime, Built-in Mic for the call, Music & Call Control, 40mAh Li-Polymer battery in each earbud, 1.5 hours charging time (earbuds), 2000mAh Lithium-ion LCD display charging case, 2-3 times charge cycle. Just take out the earphones/earbuds from the case and it will be connected to your phone automatically.put the earphone into the charging compartment and cover it, the earphone will be charged automatically, the earphone will light up in red when charging, and it will go out when it is full.