DESTEK iPhone X Battery Case Ultra-thin 3200mAh Rechargeable Portable Charging case External Battery Pack (black) Battery performance of up to 5.5 hours talk time or up to 200 hours standby Left or right ear wearable Bluetooth Class 2 offers a wireless connection up to 10 meters (33 feet) Weighs 17.5 grams Charge time is approximately less than 2 hours