Incutex electronic key - finder, key finder with transducer, black electronic means to detect key, key finder with transmitters in credit card format, wireless keyfinder, find lost keys Product description: Key Finder with electronic transmitter in credit card format Even works through walls! RF wireless technology Batteries: 2 x CR2016 3V Delivery 1x Key Finder Receiver Blue 1x transmitter in credit card format 2 x CR2016 3V battery Note: This product is brand Incutex Incutex