I designed a new version of the RF-603 based buzzer. The housing now looks exactly like the one of the Bluetooth BLE based buzzer. The flat design is more stable and looks pretty good. It contains an RF-603 transceiver that is powered by two AAA batteries. Both channel selector and main switch are accessible through the housing bottom.
I re-designed my booth buzzer. It now features a Bluetooth LE module that is powered by a LiPo battery. Charging is done through USB.
The buzzer is user-configurable to send a mouse click or keyboard click to any device with Bluetooth LE connectivity.
For more information see my Buzzer page.