Specifications: Wearing Style: True Wireless Earphones Ear Coupling: Ear Canal (In-ear) Chipset: Qualcomm aptX Frequency Response: 21 Hz to 20kHz Transducer Principle: Dynamic, Closed Transducer Size: 40mm Sound Pressure Level (SPL): 104 dB(1kHz/ 1mW) Impedance: 16Ω Microphone Principle: MEMS x 5 Power Supply: Built-in Lithium rechargeable Batteries 3.7V Left earbud > 48mAh Right earbud > 48mAh Charging case > 360 mAh Operating Time: 8 hrs (music playback via A2DP) with rechargeable batteries of the earphones *25 hrs with rechargeable battery of the charging case* Charging Time Earphones: approx. 2.0 hrs Charging case > approx. 2.0 hrs Charging Case Input: USB-C Ingress Protection (Earbuds): Splash proof (IPX5) Weight: Left earbud > approx. 5g Right earbud > approx. 5g Charging case > approx. 34g Volume Control: Yes Version: Bluetooth specification version 5.1 Profiles: HFP, AVRCP, A2DP Noise Cancellation: Ambient Mode Effective Range: Line of sight approx. 30ft (10m) Transmission Frequency: 2.402 MHz to 2.480 MHz Output Power: 10mW (Max) Supported Audio Format(s): SBC Service Warranty: 1 year What's in the Box? E3500 Earbuds (2pc L&R) | Charging Case | Charging Cable | Ear Adapters (S-M-L)