Energy Sistem Style pocket Bluetooth earphones

Audio Frequency response: 20 Hz ~ 20 kHz Driver diameter: 6 mm Type: dynamic Connectivity Bluetooth® 5.1 (class 2) wireless technology. Frequency band: 2.4 GHz Maximum output power: < 20.00 dBm Compatible Bluetooth profiles: HSP / HFP / A2DP / AVRCP Compatible with SBC codecs Up to 20 m distance range True Wireless function with auto-pairing Hands-free function Voice assistant compatible with Google/Siri Microphone Type: built-in microphone Sensitivity: -42 dB ± 3 dB (@1 kHz) Frequency response: 100 Hz ~ 10 kHz Battery Earbuds: Capacity: 25 mAh (each earbud) / 3.7 V Type: lithium-polymer battery Battery life at medium volume: 4 hours* Charging time: 1.5 hours Charging method: charging case *This value is approximate. The battery life depends on the selected volume and the type of music. Ch