Bluetooth: Bluetooth V5.3 Operation frequency: 2.402-2.480GHz Supported profile: HSP HFP A2DP AVRCP Operation range: UP to 10 meters Music time: About 60 hours (70% volume) Talking time: About 35hours (70% volume) Battery: 400mAh Lithium polymer Battery Charge time: About 2hours Operating temperature: -10~55? Speaker unit diameter: 40mm Rated impedance: 32 ± 15% Frequency Range: 50-50kHz Sensitivity: 113± 3dB Product size: 193 * 157 * 54 mm Product weight: 141g