Promate (Vutune) BT Wireless Headphones - Active Noise Cancellation - LCD screen - Black Bluetooth Version: V5.3 Input Rating: DC5V,1A Screen Size: 2.01", 240x296, LCD Speaker Diameter: 40mm Impedance: 32Ohm Speaker Frequency: 20Hz-20kHz Microphone Polar Pickup: Omnidirectional Charging Time: 2hrs Playing Time: 50Hrs (ANC Off)/ 30Hrs (ANC On) Battery Capacity: Headphones: 600mAh; LED Touch Screen:200mAh Battery Capacity: Li-Polymer Warranty: 2 Years Warranty Period