Features: Elastic clip cannot be broken. Shock absorption seal does not not hurt the phone The holder is equipped with a shock-absorbing cushion to protect the phone case and prevent scratches. Highlight headlights, night driving protection, lighting design Double lamp beads, to ensure safe riding at night. Mobile charging, convenient and fasted, built-in 2000mAh large capacity battery, you want to charge whenever you want. USB charging, riding more convenient , comes with USB charging, can adapt to a variety of USB chargers. 130 decibel loudspeakers, shouting goodbye, up to 130 decibel passers-by, effective sound warning, vehicles. : Material: ABS Color: black, black and red, black and blue (optional) Battery capacity: 2000mAh / 4000mAh (optional) Lumen: 250 lumens Charging time: 5 hours Output current: 0.7A Lighting mode: strong light - weak light - Fasted flash Support range for mobile phone: 4 - 6 .3 inches Speaker decibel: 130 decibels Sound mode: 5 sound modes Item size: 125 * 52mm / 4.9 * 2.0in Item weight : 157g / 5.5oz Package size: 158 * 115 * 60mm / * 4.5 * 6.2 2.4 Package weight: 273g / 9.6oz (2000mAh ) 281g / 9.9oz (4000mAh) Packing List: 1 * Bike Light