Clap switch (no microcontroller)

My girlfriend want her lamp switch, but from bed! So I must planned a clap switch. The circuit is very easy: I don't used a microcontroller. The input is a microphone, what the audio signal accept. The next part a audio amplifier, what the signal amplify, suiting. The good signal process a flip-flop. The first clap turn on a relay, and the second clap turn off the relay. To the circuit I used a SMD parts (0805), that the size be small. The circuit can approx. 2000W switch, in 230V. The PCB has two layer. The circuit operate good, the sensitivity is very good.