Steelmate A881 Car Engine Lock for Smartphone Bluetooth Connection Smart Car Alarm for iOS Andriod System Features: Anti-decoding. Bluetooth connection between Smartphone and the ECU. Compatible with both iOS and Android system. Alarm for illegal ignition. Immobilize automatically. Auto arming after flame out. Engine lock / unlock automatically. Valet mode for car maintenance. Concealed installation. Support 4 for iPhone and Andriod smartphones. Height: 2.4in Width: 5.7in Length: 5.7in Weight: 0.53lb