Product Features Color: Black Size (LWH): 3.94 inches, 1.97 inches, 3.94 inches Weight: 0.64 ounces Minimum Rated Talk Time: 4 hours Minimum Rated Standby Time: 100 hours Product Description Color: Black Item Description: Brand : Sanwo M1 Style:In-Ear Is Wireless:Yes Communication:Wireless Bluetooth Version: V4.1 Wireless Distance: 10 m Max Power: 20mw Standby Current: ≤500ua Battery: 50mah 3.7v Li-Polymer Battery Working Current: ≤18ma Input: Dc 5v Full Charging Time: About1.5 Hours Drive Unit: 2*6mm Sensitivity: 114±3db Resistance: 16±15% ? Frequency Response Range: 2400.0～2483.5mhz Line Length: 28cm Plug Type: Micro USB Connectors: USB Use For: Mobile Phone Package Includes: 1 x Bluetooth Earphone 1 x Charge Cable 4 x Ear Cap 1 x Manual 1 x Storage Boxchina