Just discovered this little chap.
* Working frequency: 2400MHz-2483.5MHz * Modulation: FSK/GFSK * Tx Output Power: 5dBm(1mW) * Rx sensitivity: -88dBm * Data rate: 1M／2Mbps * Tx current: ＜30mA * Rx current: ＜23mA * Standby current: ＜3uA * Channel selection: 83 channels * Data interface: SPI * Operating temperature: -40-85°C * Power supply: DC 1.9V～3.6V * Size: 16.8x12.8mm(PCB antenna included)
Price seems good at around the $5 mark. SPI interface. Built in antenna. I wonder what the range/data rate is like.