Output power: RMS 3W x 1
Frequency : 150HZ-18KHZ
Speaker Specifications : Φ40mmx1/4Ω
Signal to Noise Ratio : ≥ 75db
Power Supply: ~ 5V-USB 3.5 stereo head
Lithium Battery : Capacity can be selected
Material: Plastic
Features: Built-in battery, USB, TF, audio input