Specification: 
· Bluetooth version: V4.1
· Support profile: Hands Free1.6, Headset 1.1, A2DP · · AVRCP 1.5.
· Bluetooth distance: 10 meters
· Continuous call duration: about 3 hours
· Standby time: about 100 hours.
· External charging voltage: DC 4.8V-5.2V
· Incoming Call, voice prompts.With status indicator.
· One for two：One Bluetooth earbuds can connect 
  two mobile phone.
· Automatically re-connect function.
· Energy saving , Automatically shut down after 5 
  minutes without connection .
· Smart Voice assistant control, Cancel Bluetooth 
  connection function                    

 Feature:
· CTN size:L54.5*W47.5*H53.5 cm   
· Master CTN:300pcs,
· Inner CTN: 75PCS
· N.W:18KG
· G.W:19KG
· Produc Size: 30.46*15.27*24.44mm
· Product weight: 4.3g,60g±2g with package.
· Package Size:  101*73*48 mm
· Material: ABS+ UV
· Battery type: Rechargeable polymer lithium-ion 
  battery，40mAh
· Audio frequency range: 20Hz-20KHz,