These Keyfobs are made of a waterproof silicone that house the 13.56 MHz RFID chip inside. These are ideal for use in access control systems or to unlock the electrical locks.
 

Chip:	Fudan 1K
Function:	Read / Write
Memory:	1 K
RF protocol:	ISO 14443A
Frequency:	13.56 MHz
Reading Distance:	up to 5 cm
Dimensions:	35 x 37 mm (monkey); 41 x 47 mm (alien)
Material:	silicone
Operating Temperature:	-25 ~ +85°C
IP Classification:	IP68