1. Super Long Battery Life, More Than 20 Hours Of Continuous Listening And Talking, 10 Minutes Of Charging, 900 Minutes Of Battery Life 2. Lavalier Bluetooth Headset, Super Large Capacity Battery 3. Built-In 5C Battery, Fast Charging In 20 Minutes, Large-Capacity 5c Battery, Fast Charging, Fast Charging, So You Don't Have To Worry About Running Out Of Power All Day Long 4. Vibration For Incoming Calls, Reminder Function 5. Bluetooth 5.2, Battery 140mAh Model: K55 Bluetooth Version: V5.2 Transmission Distance: 10M Transmission Frequency: 2.4Ghz Charging Voltage: DC5V Charging Time: Less Than 20 Minutes Talk Time: About 20 Hours Music Time: About 20 Hours Standby Time: About 180 Days Battery Capacity: 140mAh Body Size: About 56 (Length) x 25 (Width) x 13 (Height) Mm (Height 20 Including The Back Clip) Support Protocol: HANDSET/HANDFREE/A2DP/AVRCP Colour:B: silver Material:plastic Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Package Contents: 1 x Lavalier Wireless Headset 1 x Data Cable 1 x Ear Cap 1 x Manual In Seven Languages Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.