Amplifier: 25 WFeatures: Whistle, Built-in Siren, Rechargeable BatteryPower Source: DCBatteries: Lithium Ion (Li-Ion)Battery Life: 8 HourMaterial: ABS PlasticLength: 14.5"Diameter: 8.3"Weight (Approximate): 2 lbPackage Contents: Mity-Meg 25-Watt Megaphone,Rechargeable Lithium-ion Battery Pack,Environmentally Friendly: YesEnvironmental Certification: WEEELimited Warranty: 1 YearMity-Meg 25-Watt Rechargeable MegaphoneNever run out of power again. The Lithium-ion battery pack with integrated wall charger is a long lasting rechargeable battery that allows you to simply charge in any 110-240V AC outlet. Coupled with the exclusive battery indicator lights feature that can only be found on AmpliVox megaphones, you will always know the status of your battery life and how much power you have left for maximum safety and security.Forget the hassle and cost of constantly replacing multiple batteries. Using the Rechargeable Lithium Pack saves you money from purchasing batteries, can be reused hundreds of times and last for years. A fully-charged battery will provide 8 hours of typical operation (defined as speaking 35% of the time at mid volume) and over one year of standby / idle time.