Black red blue ● bluetooth connection distance 10m ● output power: 3w*2 Low magnetic trumpet: 4 Ω 10 w ● input sensitivity: 400mV ● signal-to-noise ratio: ≥80dB ● operating voltage: DC 5V -- jerry 4.0 ● built-in bluetooth wireless transmission, caller hands-free function ● stereo audio transmission protocol (A2DP V1.2) ● supports playing MP3 songs stored in the TF card ● supports all audio input from the external 3.5mm terminal ● support FM automatic search ● support recyclable charging ● built-in battery actual capacity: 1200MAh charging time 3H, use time 3-6h Bare machine size: 245*45*90mm color box size; 262*52*100mm net/gross weight/set: 564g/622g/ PCS outer box size; 53*28*52CM net weight: 28.2kg gross weight/box: 31.1kg PCS/ box: 50pcs The spot