Portable Stereo Mini Speaker 3.5mm Jack Plug In For Laptop Tablet Phone US Sell 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: Small and lightweight, hang hole design, easy to carry Low voltage, low power consumption, power amplifier IC, pure sound quality, low distortion. Suitable for iPod, MP3, MP4, MP5, mobile phones, computers and other devices with a 3.5mm audio jack. Comes with an audio cable at the bottom of the speaker. Equipped with a USB charging cable. 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. Unique design -- Retractable speaker. Specifications: Material: ABS Size: Approx. 52 * 52 * 38mm / 2.0 * 2.0 * 1.5in Impedance: 4 (Ω) 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: 180mah Color: Black, White (Optional) Package weight: 78g Package List: 1 x Speaker 1 x USB Charging Cable