Zonoki bt401 wireless metal shell headset hang ear type sports headset Bluetooth Handsfree HD calls perfect sound quality Model BT401 Bluetooth Version:V4.1 Bluetooth Profile: A2DP,AVRCP,HFP,HSP Transmitter: Class 2 Speaker power Rate:10mW Speaker Diameter:10mm Battery Capacity:50mAH Charging Time:2 hours Working Time:4 hours Standy Time:50 hours Input Voltage:5V Net Weight:6.5g Full wight:75g Color: Black,White