Bluetooth 5.0 chip has 10m transmission space, bringing high performance. Excellent stereo and heavy bass sound effect will be provided. Exquisite craftsmanship makes the speaker has durability. TF card is supported to play music. Mini compact size bluetooth-compatible speaker is easy to be carried. With large capacity battery, the wireless sound box can work for a long time. Made of premium aluminum alloy material, the bluetooth-compatible speaker is reliable. Diameter of the voice box is 8.5cm and height is 3.7cm. It is suitable for home, office, travel, dormitory, etc. Item Name: bluetooth-compatible Speaker Material: Aluminum Alloy Output Power: 3W Interface Type: USB Battery Capacity: 400mAh (Included) Playback Time: 4 Hours Frequency Range: 100Hz-20kHz Transmission Distance: 10m Bluetooth Version: 5.0 Signal to Noise Ratio: 70dB Playback Format: MP3 Size Details: 8.5cm x 8.5cm x 3.7cm/3.35" x 3.35" x 1.46" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x bluetooth-compatible Speaker 1 x USB Charging Cable 1 x User Manual