Transmitter (square unit)

Pins: 3. Gnd (closest to Ant), Pwr, Tx/ATAD (‘DATA’). Breadboard friendly. Pins might me marked. ‘R’ might also be present on some units indicating receiver.
Signaling: Digital (digital read). Data to be transmitted is read by the Transmitter’s digital pin.
Input voltage: 3 ~ 12 V DC (for max power use 12 V)
Input current: max ≤ 40 mA (12 V) max, min≤9 mA (3 V)
Resonance mode: SAW
Modulation mode: ASK
Working frequency: 315 MHz to 433 MHz (some has customisable frequency)
Transmission power: 25 mW (315 MHz at 12 V)
Frequency error: +150 kHz (max)
Velocity: less than 10 Kbps
Self-owned codes: negative
Size: 19 x 19 x 7 mm
Breadboard friendly: yes
Pin size: male, 5 x 2.54 mm

Receiver (longer unit)

Pins: 4. Pwr (closest to Ant), Rx, Rx, Gnd. Breadboard friendly. Pins might be marked.
Signaling: Digital (requires interrupts, digital write). Data that is received is transmitted by the Receiver’s digital pin.
Input voltage: 5.0 V DC +0.5 V
Working current: ≤5.5mA max
Working method: OOK/ASK
Working frequency: 315 MHz – 433.92 MHz
Bandwidth: 2MHz
Sensitivity: excel –100 dBm (50 Ω)
Transmitting velocity: <9.6 Kbps (at 315 MHz & -95 dBm)
Size: 30 x 14 x 7 mm
Breadboard friendly: yes
Pin size: male, 5 x 2.54 mm