Description: With hang hole design, this speaker built-in battery is so small and lightweight that you can take it anywhere anytime. Equipped with a 3.5mm audio cable at the bottom, you can listen to music after connection with mobile phone, MP3, MP4, computer and other devices with a 3.5mm audio jack. Features: 1. Small and lightweight, hang hole design, easy to carry 2. Low voltage, low power consumption, power amplifier IC, pure sound quality, low distortion. 3. Suitable for MP3, MP4, MP5, mobile phones, computers and other devices with a 3.5mm audio jack. 4. Comes with an audio cable at the bottom of the speaker. Equipped with a USB charging cable. 5. Built-in 180mah battery, no external power supply needed, provides one and half hours of playing time at maximum volume, or about 3 hours at 50% volume. 6. Unique design -- Retractable speaker. Specifications: Material: ABS Size: Approx. 52 x 52 x 38mm / 2.0 x 2.0 x 1.5in Impedance: 4 () Distortion: 0.5 (%) Frequency response range: 200-20K (Hz) Sensitivity SNR: 89db (dB) Speaker Unit size: 3.5 (mm) Carrying power: 2.2 Battery capacity: 180mahCharging Cable Length: 50cm/19.7inSelf-contained: 3.5mm/0.14inAudio Cable Length: Approx. 12cm/4.7 in Package weight: 78g Package List: 1 x Speaker 1 x USB Charging Cable .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1Small and lightweight, hook hole design, easy to carry. 2Low voltage, low power consumption, power amplifier IC, pure sound quality, low distortion. 3Suitable for MP3, MP4, MP5, mobile phones, computers and other devices with a 3.5mm audio jack. 4Comes with an audio cable at the bottom of the speaker. Equipped with a USB charging cable. Unique design -- Retractable speaker. 5Built-in 180mah battery, no external power supply needed, provides one and half hours of playing time at maximum volume, or about 3 hours at 50% volume.