EM-A3 Bluetooth Speaker Feature:
Exclusive design with patent
Private tooling With mobile phone docking
Bluetooth 3.0
CE, FCC, RoHS  

Bluetooth portable speaker parameters:  
Output: 2.5W
Bluetooth standard: V3.0
Speaker: 40mm
Built-in battery: 3.7V 400mAh
Input voltage: DC 5V
Charging time: 2 to 3 hours
Playing time: up to 5 hours
Impedance for speaker: 4Ω
THD: ≤1% (1Khz/1W)    
SNR: >80dB Frequency
Response: 160Hz to 18 KHz
Reception distance: ≥10m
Material: ABS, rubber oil plated
Dimension: 60(L)x60(W)x68(H)mm