Details The sport headphones features LED illuminated neckband, advanced V4.1 and crystal clear sound effect, which is perfect for night runner or daytime workout. The two ear hooks adopts skin-friendly materials and ergonomic shape design to ensure secure and comfortable wearing experience. The CSR4.1 chip offers you wonderful sound effect when enjoy music and crystal clear hands-free call with high-sensitive microphone. 120mAh battery can lasts up 6-hrs playing time or 8-hr talking time after fully charged with included USB charging cable. LED Night Light: The neckband will be illuminated at night and offer three modes (fast flash, slow flash and constant light modes) to choose via the light On/Off button, which ensure safety when sport at night.Crystal Clear Sound Effect: Adopts advanced CSR4.1 + EDR technology to ensure transmitting strong signal and offer high-quality sound effect. Besides, echo cancellation technology ensures high definition sound reproduction.Ergonomic and Skin-Friendly Design: The two ear hooks adopts skin-friendly soft silicone materials and has ergonomic shape with frosted surface coated to ensure secure and comfortable wearing experience. Also the sweatproof materials keeps the earphone more durable. Ideal for Running: Its lightweight and sweat-proof design make it ideal for running, biking, hiking, yoga, exercises, travelling, etc. Ultra-Long Music Playtime: Embedded 120mAH lithium-ion battery can last up to 6-hour music playtime and 8-hour talk time in 3-hour full charge. Also, it will display battery level on iOS devices. Brand: KOCASOWireless Version: CSRV4.1 Transmitting Power: Class 2 Protocols Supported: HSP, HFP, A2DP, AVRCP Driver Unit: ?10mmImpedance: 32ohm�15%Talk Time: (LED Off): Up to 8 hours; (LED On): Up to 5 hoursPlay Time: (LED Off): Up to 6- hours; (LED On): Up to 4 hours Standby: (LED Off): Up to 90 hours; (LED On): Up to 13 hours Charge Time: = 3 hours Operation Range: =10MBattery: built-in 120mAh lithium battery Weight: 0.76oz Available Colors: green, blue, red, orange Package Size: 12.7*16.7*3.5cm/5�*6.57�*1.38� (L*W*H) Package Weight: 96g/0.21lbs