Box material: wood. Connection method: Bluetooth connection. Effective distance: 10 meters. Frequency response range: 40Hz-20KHz. Channel: Mono. Power supply mode: USB. Whether built-in battery: built-in battery. Built-in battery capacity: 500mAh. Charging time: 2-3 hours. Playing time: 4-6 hours at normal volume. Bluetooth mode: Suitable for all mobile phone Bluetooth modes. Combination form: single piece. Color: picture color. Appearance size: 9.5*9.5*3.2cm/3.74*3.74*1.26 inches. Reminder: Since the product is made of solid wood, there may be color difference, tree spots, mineral lines, special lines, etc., which are normal phenomena!