Master Lock Bluetooth Smart Padlock - Waterproof, Shatterproof, and Rechargeable Specification: * Bluetooth 4.0 technology for easy pairing and unlocking * Waterproof and shatterproof design for durability * Rechargeable battery with up to 6 months of battery life * App available for iOS and Android devices * 120dB alarm for added security * Compatible with Amazon Alexa and Google Assistant Keep your valuables safe and secure with the Master Lock Bluetooth Smart Padlock. This innovative padlock features Bluetooth 4.0 technology for easy pairing and unlocking, a waterproof and shatterproof design for durability, and a rechargeable battery with up to 6 months of battery life. Plus, the padlock includes a 120dB alarm for added security and is compatible with popular voice assistants like Amazon Alexa and Google Assistant. Whether you're locking up your bike or securing your shed, this smart padlock has got you covered.