We are an electronic processing factory in Shanghai,China, specializing in processing, R & D, design and sales of electronic products. Sincerely hoping your inquiry. More Product specifications BLUETOOTH version V5.0 BLUETOOTH Communication distance 10m Standby time 120 hours Talk time 4 hours Music playback Approximately 5 hours Battery type Polymer Lithium Battery Charging case Battery capacity 500mAh compatible BLUETOOTH Profile: HFP / HSP / AVRCP / A2DP Allowable operating temperature -20 C -60 C Weight 45g Compatible models iOS / Android / Windows (compatible with bluetooth 4.2 or higher)