Black red blue ● output power: 3W *2 Low magnetic trumpet: 4 Ω 10 w ● input sensitivity: 400mV ● signal-to-noise ratio: ≥80dB ● working voltage: DC 5V ● built-in bluetooth wireless transmission, call hands-free ● 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 for recyclable charging ● built-in battery actual capacity: 18650 1200MAh Bare machine size: 240*65*80mm color box size; External carton size: 52*37.5*45CM net weight: 31KG gross weight/carton: 32KG PCS/ carton: 50pcs The spot