Dynamic, frequency response: 20 Hz - 20 kHz, Bluetooth 5.0, HFP/A2DP/AVRCP/AVCTP profiles, range up to 10 m, True Wireless function with automatic pairing, hands-free, volume control, playback control, built-in microphone, headphone battery : capacity 30 mAh (each handset), type: Li-Po, operation up to 4 hours, charging time: 1 hour, charging casecapacity: 400 mAh, Li-Po, battery life: 16 hours, charging: micro USB, headphone weight : 4 g, charging caseweight: 25 g (without headphones), charging casesize: 70 x 30 mm, total weight: 33 g