Specification:Specification:Brand Name: EarsonModel Number: ER-163bluetooth Version: 4.0Horn Unit: 40mm 4 5W*2Charging Voltage: DC 5V 500mABattery Capacitty: 1500mAhWorking Voltage: 3.7VPrequency Response: 40Hz-18kHzSNR:65dBDistortion:1%Compatible With: Most of bluetooth devices like smartphone, PC, Pad.Features:Built-in bell button and remote photogragh.Five defenses: (IPX3 dustproof, IPX5 splash waterproof, shockproof, scrapeproof, crashproof)Specific buckle design (convenient and fashion)360 degree coding switch volume control and three -level LED battery indicator function.Function: Hands-free, TF card, AUX connection and bell signal.Package Included:1 X EARSON bluetooth Speaker1 X USB Charging Cable1 X Audio Cable1 X Buckle1 X User Manual (Chinese/English)