S-40A03:40X9.5mm 32Ω 50mW 112dB 170- 3KHzS-40B24:40X6.3mm 100Ω 30mW 118dB 120- 2.5KHzS-40N56:40X4.8mm 8Ω 0.3W 92dB 550- 8KHzS-40P01R:40X5.3mm 8Ω 0.4W 75dB 1.3- 7KHzS-40R42:40X16.4mm 8Ω 0.25W 90dB 500- 5KHz