Features Characterized by its elegant shape Her voice is loud and pure. Da Non-Mike his voice is clear COMFORTABLY DESIGNED FOR LODEN TO BE USED LONGER It can be operated by Bluetooth or by connection You can use it on mobile or computer It has a noise insulation It will work with you more than 8 hours Description Model: SD-1008 Bluetooth: V5.0 Working time: 6-8 hours Delivery: Wireless – Wired Battery: 250mAh, 3.7V Charging time: about 2 hours