Bluetooth compatible version: 5.1 Headphone battery: 140mA Link distance: Hurra barrier 15 m Horn: 8mm copper ring, titanium film Standby connection: 600-1200ua Listening: 20 hours, speaking: 25 hours Sensitivity: 120 dB Resistance range: up to 32 Ω Frequency response range: 2000-2200hz black color Product size: 80*68*25mm Product weight: 30 grams Package size: 95*73*33mm Package weight: 50g note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.