👍👍👍 Product features: ✨ Speaker unit: 40MM diameter, impedance: 32 Ω± 15% ✨ Sensitivity: 98dB ± 3dB ✨ Frequency response: 20Hz~20000Hz ✨ Bluetooth specifications: Bluetooth V5.4, Zhongke Lanxun AB882C ✨ Support agreement: A2DP ,AVRCP,HSP,HFP, Transmission range: 10 meters Transmission frequency: 2402-2480MHz ✨ Maximum Radio Frequency Output Power (EDR): 3DB ✨ Modulation type (EDR): GFSK, π/4-DQPSK ✨ Charging voltage: DC 5V , Charging time: about 2 hours ✨ Talk time: approximately 90 hours (with ANC turned on for 45 hours), music time: 90 hours (with ANC turned on for 45 hours) (at 80% volume) ✨ Standby time: over 200 hours, 800mAh A-class polymer battery ✨ Net weight of product: 231g ✨ Product size: 198 * 153 * 81mm