Livall MT1 Neo.Helmet type:Semi-integral helmet, Construction type:Robust construction with hard shell, Finish type:Gloss.Specifications:-Sustainability certificates:CE, United States Federal Communications Commission (FCC), RoHS.-Package width:305 mm.-Package depth:225 mm.-Package height:150 mm.-Weight:310 g.-Quantity per package:1 piece(s).-Battery voltage:3.7 V.-Battery type:Integrated.-Battery capacity:450 mAh.-Charging time:3 h.-Continuous audio playback time:6 h.-Standby battery life:180 day(s).-Autonomy:10 h.-Input voltage:5 V.-Input current:0.5 A.-Final type:Brightness.-Bluetooth Low Energy (BLE):Yes.-Adjustable adjustment:Yes.-Coloration:Monochrome.-Rear light:Yes.-Water resistant:Yes.-LED backlight:Yes.-Hands-free calls:Yes.-Product main color:Black.-Type of sports caps/headwear:Helmet.-Gender type:Unisex.-Age of consumer:Adult.-Activity:Road cycling, Traditional roller skating, Mountain biking, Urban cycling.-Size value 1:L.-Type of construction:Robust construction with hard shell.-Helmet type:Semi-integral helmet.-Head circumference range:58 -62 cm.-Ventilation:Yes.-Number of ventilation holes:21.-Ventilation type:Fixed.-Built-in LED lighting:Yes.-SOS alert function:Yes.-Size classification 1:SML.-IP Code (International Protection):IPX4.-Fall detection:Yes.-Microphone sensitivity:-39 dB.-Built-in microphone:Yes.-Number of speakers:2.-Integrated headphones:Yes.-Bluetooth version:4.1.-Bluetooth:Yes.