Features 1.HIGH POWER SPEAKERS: Teacher classroom microphone has a high power speaker with 1500 square meters of amplification and 72 hours of battery life. 2.DOUBLE LAYER PVC CABLE: Mini voice amplifier is made of double layer PVC cable, which is strong against pulling and shielding. Clear sound, no background noise. 3.LAVALIER HEADSET: Voice amplifier is a lapel clip headset that easily clips onto the collar, making it suitable for teachers' lectures and outdoor guides. 4.METAL 3.5MM PLUG: Wired voice amplifier uses a high strength metal 3.5mm plug, sturdy and durable, 100,000 times unplugging experiment. 5.SMALLER AND LIGHTER: Headset microphone amplifier can be fixed in your belt or pocket. Smaller and lighter, just like a floating feather. specificationItem Type: Wired Voice Amplifier Material: ABS Plastic, PVC Battery Type: Lithium Battery PackageList 1 x Amplifier 1 x Instruction Manual 1 x Lithium Battery 1 x Certificate Of Conformity 1 x Data Cable 1 x Belt 1 x Microphone