MIKROE-2903 OOK TX Click Mikroe MIKROE-2903 OOK (On-Off Keying) TX Click is a simple wireless transmitter that operates at a frequency of 433MHz. This click allows the realization of a simple, low-speed wireless ad-hoc communication network between a transmitter and a compatible receiver, such as the OOK RX click. TMikroe MIKROE-2903 OOK TX Click features a programmable transmit power in 1dB steps and On-Off Keying (OOK) modulation with power ramp-up control. Typical applications include remote low-speed communication (remote keyless access and remote fan or light control) and unidirectional low-data rate wireless links.