S17 Mini Portable Tour Guide Teaching Loudspeaker with Screen Display 1. Material: Rubber paint, ABS, electronic components 2. Function: Teaching, tour guide, conference, training 3. Built-in battery: 2200mAh lithium battery 4. Charging time: 3 hours 5. Use time: 20 hours 6. Standby time: 72 hours 7. Includes head-mounted acoustic microphone, ergonomic design, comfortable to wear 8. Equipped with 3-inch speakers, delivering louder volume and wider sound transmission 9. Supports U disk and TF card playback 10. Adjustable belt length 11. Dimensions: 9.4 x 8.4 x 2.8 cm 12. Weight: Approximately 230 grams Package Includes: - Speaker x 1 - Headset Microphone x 1 - Belt x 1 - Data Cable x 1