Plug-in Speaker And Speaker Portable Amplifier With Wired Microphone Explanation [Compact But Powerful] - If you want to buy a compact and lightweight personal voice amplifier, s17 is tailor-made for you. This is a portable speaker microphone < / p > < p > 30w output power greatly amplifies your voice and protects your vocal cords so you can easily get your voice heard by 25-100 people < / p> The small voice amplifier is equipped with a large capacity 2200mah rechargeable lithium-ion battery which can work for 12 hours on a fully charged battery. Recharge easily with the included USB cable. Charges in 3 - 5 hours < / p > < p > [easy to carry] The portable speakers have adjustable straps that can be tied at the waist or hung on the neck. The teacher speaker amplifier has a clip on the back that can be attached to the belt or belt. Adjustable wired earphone microphone < / p > < p > [stable performance] - This is an original voice amplifier with stable performance. The portable mini helmet is a flexible swan collar located on the mouth. It is ideal for all organizations and people who need to project sounds. It is applicable Teaching, coaches, singers, trainers, tour guides, shopping malls, conferences, yoga, outdoor presentations, etc. < / p > < p > dimensions: 8.4 x 9.2 x 2.8 cm < / p >