Volume control : 10 levels 
	
4 tones setting : low sound emphasis, middle sound emphasis, high sound emphasis, normal
	
Battery life time : 24 hours 
	
Battery charging time : 1 hour 30 minutes 
	
Battery indicator : 3 levels
	
Battery type : Li-polymer, rechargeable 3.7v/80mA.
 
Dimensions: 0” L x 0” W x 0” H
Weight: 0