Bluetooth specification: V4.1 🔸Sleek, sharp and simple: 🔸Easy to use and aesthetically pleasing 🔸The Bluetooth technology enables you to go to the gym, run, cycle and 10m away from your Bluetooth device Leave your phone in the locker room and still have control of your song choice with just a click of a button 🔸Built in microphone: You can answer or reject calls with just one tap on the side of the headset. Hands-free and clear quality sound 🔸Adjustable headband: Allows you to create the perfect fit and maximum comfort 🔸Support 3.5mm audio input, convenient for use 🔸Built-in 500mAh Lithium-ion battery: You can be on the move all day with these headphones with the long battery life of 8-10 hours per charge 🔸Charging time is just for 2 hours, wait for the blue flashing light on the control panel 🔸Function: Answering Phone,Bluetooth,Microphone,MP3 player,Song Switching,Voice control 🔸Connectivity : Wireless 🔸Connecting interface : 3.5mm,Micro USB 🔸Application: Computer,Mobile phone,Portable Media 🔸SNR: No less than 80db 🔸Working Time: 8-10 hours 🔸Bluetooth distance: W/O obstacles 10m 🔸Bluetooth 🔸Battery Voltage: DC 5V 🔸Battery Capacity(mAh): 500mAh 🔶Package Contents: 1 RLXTEC Wireless Bluetooth V4.1 Headset Support Handsfree with AUX Slot, 1 x USB Charging Cable, 1 x Audio Cable, 1 x User Manual ✨SHIPS SAME DAY OR NEXT BUSINESS DAY ✨ 🪻COMES FROM A CLEAN, SMOKE FREE HOME BUT IT IS A LOVING DOODLE DOG HOME🪻🐕‍🦺🫶🏻