General Specification Brand Bakeey™ Model S4 Wearing Type In-ear Net Weight (g) 8g Technical Parameters Microphone Yes Wired Control Support bluetooth Version 4.1 Transmission Distance 10M Receive Sensitivity 97dB Impedance 32Ω Frequency Response 20-20kHz Battery Capacity 70mAh, 3.7V Charging Time (h) 1-2h Talking Time (h) Approx.3h Working Time (h) Approx.6h Standby Time (h) Approx.100h Package Included: 1* BONSS bluetooth Earphone 2* pair of earmuffs 1* USB cable 1* cable clip 1* User manual Ships in 7 business days. It is shipped from China. Delivery is provided by China Post Air Mail. Delivery time depends on the couriers, local customs in your country also holidays, weather conditions. Usually it takes from 39 to 60 days, depending on the customs at your country.