New fascia gun, relaxing muscle massager, sports neck mask gun

Motor type: brushed motor
Specifications: USB
Function: Mini portable, multi-speed adjustment, low noise, multi-speed frequency conversion
Speed: 5 or more
Number of massage heads: 4
Battery life: 3-6h (inclusive)
Built-in battery capacity: 2000mAh-4000mAh (inclusive)
Is it a built-in battery: built-in battery
Noise: below 36dB