Specifications: Built-in 2000mAh battery can be used for 10 days. Support for USB disk/TF card reader and MP3 music player. Portable voice amplifier is designed with large volume and clear sound, and there is no noise. It is suitable for teaching, tour guides, parties, lectures, promotions, training, etc. Item Name: Audio Speaker Material: ABS Battery: Built-in 2000mAh Battery (Included) Charging: DC5V 1A. This audio speaker can be charged by mobile phone charger. Wireless Function: Support FM Wireless Microphone, 2.4G Wireless Microphone One-key Recording: with One-key Recording Function (When recording, you need to insert a TF memory card or U disk). Loop Playback: Support One-key Loop Playback External Storage Play: Support U Disk/TF Memory Card Player (MP3 Format) FM Radio: Five-section Extendable Antenna Amplification Function: Support Plug-in Microphone Function Mode: "M" Function Key Support Switch to FM or MP3 Player Features: Wired/Wireless/Neck Clip, with Microphone, Teaching Accessory Size: 12cm x 9.2cm x 3.2cm/4.72" x 3.62" x 1.26" (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: Wired Microphone Type: 1 x Audio Speaker 1 x User Manual 1 x USB Cable 1 x Wired Microphone 1 x Belt 1 x Charger Wired Microphone + Wireless Microphone Type: 1 x Audio Speaker 1 x User Manual 1 x USB Cable 1 x Wired Microphone 1 x Belt 1 x Charger 1 x Wireless Microphone Wired Microphone + Neck Clip Microphone Type: 1 x Audio Speaker 1 x User Manual 1 x USB Cable 1 x Wired Microphone 1 x Belt 1 x Charger 1 x Neck Clip Microphone