Dear buyer: When purchasing this Bluetooth headset, please read the following instructions: Due to long-term transportation, the power of tws will be exhausted. You will not be able to use the headset when you receive the package. It may be powered off. The first thing to do is to charge the headset box for 30 minutes. Very important. Thank you! Feature: 1. Briefly play (pause) music/answer the call; 2. Double (right) headphones double short press to reduce (increase) the volume; 3. The left (right) earphone presses 3 the next (last) music; 4. Easily wake up Siri 5. Cancel the open situation and close it to the closed situation; parameters: 1. Product weight: 4-5g (single earphone). 2. Working time: 2-3 hours. 3. Standby time: 100/h for one ear and 60/h for both ears. 4. Charging time: 1-1.5 hours. 5. Single earphone battery capacity: 35mAh. 6.Charger Box Betty: 300mAh. 7. Wireless distance: 10m. 8. Compatible mobile phones: headphones are compatible with Android, IOS,Microsoft, etc., 100% of mobile phones with Bluetooth. Products include: 2 *Bluetooth headsets 1 * charging box 1 * Charging cable 1 * User Manual Dear buyers:We runstrict tests for every product before shipping, if there's quality problem or any questions about the usage, please kindly contact us first before start a dispute. We are confident that we can reach anagreement by our service and communication. Thank you.Wish you happy shopping!!!