Features: Never Be Unheard Again -- Portable microphone and speaker has outstanding amplification function.It can be used it for a presentation in a small/ medium room to a group of 25-100 people Easy to Setup & Use -- Plug and play,with the range in the volume control,you can easily adjust the volume. This is a portable microphone for the elderly and teachers. Portable size: small size, light weight, easy to store and carry, you can put it in your pocket or backpack, without taking up too much space, and enjoy wonderful music freely. Upgraded Bluetooth-compatible 5.0: more stable connection, supports bluetooth-compatible connection, making your life more interesting and relaxing, providing better experience. Multi-format Playback: Direct playback without conversion, supports avi, wav and other formats of video playback, it supports MP3/APE/FLAC/WMA/WAV/AAC-LC and other music formats. Can tie the voice amplifier around your waist or hang it on your neck with the help of the waistband, very easy Up to 128GB Expansion: Support memory expansion memory, up to 128GB TF-card expansion (TF-card not included). Specifications: Material: ABS-plastic Size: Approx. 8.4x2.8x9.2cm Type: without Memory, 8G, 16G, 32G, 64G(optional) Audio Format: APE (Fast/Normal compression, 800Kbps C 1000Kbps, sampling rate 8KHz-48KHz), FLAC (1000Kbps C 1200Kbps, sampling rate 8KHz-48KHz), MP3 (8Kbps C 320Kbps, sampling rate 8KHz-48KHz), WMA (5Kbps C 384Kbps, sampling rate 8KHz-48KHz), WAV (32Kbps C 1536Kbps, sampling rate 8KHz-48KHz), AAC-LC (8Kbps C 320Kbps, sampling rate 8KHz-48KHz), Recording Mode: MIC Recording Format: WAV Video Format: AVI resolution 128 160 Picture Format: support JPEG/JPEG/BMP e Book Format: