This is a Flat 4.8 volt 1000mAh Reciever Battery by Airtronics. FEATURES: Preassemble Transmitter Pack AEL Cell Type Male Blue Z Connector INCLUDES: One 4.8V 1000mAh Receiver Battery with "Z" Connector. REQUIRES: Nothing SPECS: Length: 66.7mm (2.625") Width: 17.5mm (0.688") Height: 44.5mm (1.75") Voltage: 4.8V Capacity: 1000mAh Configuration: Flat Weight: 115 grams (4.06 oz)