Outdoor waterproof card sound

Effective distance: within 20 meters (under open environment)
Frequency response: 80HZ--20KHZ
Charging voltage: 5V 1A
Play time: about 8 hours
Battery capacity: 2200mAh
Signal to noise ratio: ≥75DB
Play mode: Bluetooth, AUX, TF card

Bluetooth version: V5.0