Portable speaker without your hands and ears, whether you are cooking dinner or doing outdoor sports, such as walking, cycling, climbing, etc., you can enjoy music. You can free your hands and ears, listen to music, answer calls and stay in touch with the world around you. Surround sound and more than music - upward-firing speakers point toward your ears, ears free, maximizing the sound you hear, while minimizing the sound others hear. While listening to music, you can always pay attention to the surrounding situation. bluedio hs lets you get closer to music and stay in touch with the world around you. Multiple Connection Modes - In addition to the latest Bluetooth 5.0 connected to your smartphone, you can also use the TF/SD card slot (maximum 32g) to listen to your favorite music or FM mode to get the latest weather and news important in your area. Lightweight and Comfortable - Ergonomic shape, resting gently on your shoulders, creates a small stereo surround private music arena, maintaining a comfortable all-day listening experience. Specification Bluetooth Version: Bluetooth 5.0 Frequency Range: 2.4GHz-2.48GHz Support Protocol: A2DP, AVRCP, HSP, HFP Frequency Response Range: 20Hz-20KHz Music Time To Average volume (full charge): about 7 hours Standby time for playing TF card music: about 65 hours Standby time after connecting the device: about 340 hours Standby time when the speaker is off: about 17,000 hours Speaker charging time: about 2.5 hours Speaker battery capacity: 650mAh Support Micro-SD card capacity: up to 32GB Decoding format: MP3, MAV FM frequency range: 87.5-108?MHZ Input voltage/current:?5?V/?500?mA Output power: 21.5W