Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Headphone Model | Headphone Class | Driver-matched dB | Construction | Earpads | Termination | US MSRP |
| --- | --- | --- | --- | --- | --- | --- |
| iGrado | Prestige | 0.1 | Plastic | Comfort Pads | 1/8" (3.5 mm) plug | $49 |
| SR60i | Prestige | 0.1 | Plastic | Comfort Pads | 1/8" (3.5 mm) plug with 1/4" adaptor | $79 |
| SR80i | Prestige | 0.1 | Plastic | Comfort Pads | 1/8" (3.5 mm) plug with 1/4" adaptor | $99 |
| SR125i | Prestige | 0.1 | Plastic | Comfort Pads | 1/4" (6.5 mm) plug | $150 |
| SR225i | Prestige | 0.05 | Plastic | Bowls | 1/4" (6.5 mm) plug | $200 |
| SR325is | Prestige | 0.05 | Aluminum alloy/ Plastic inner sleeve | Bowls | 1/4" (6.5 mm) plug | $295 |
| RS2i | Reference | 0.05 | Hand-Crafted Mahogany | Bowls | 1/4" (6.5 mm) plug | $495 |
| RS1i | Reference | 0.05 | Hand-Crafted Mahogany | Bowls | 1/4" (6.5 mm) plug | $695 |
| GS1000i | Statement | 0.05 | Hand-Crafted Mahogany | Circumaural Bowls | 1/4" (6.5 mm) plug | $995 |
| PS500 | Professional | 0.05 | Hand-Crafted Mahogany / Aluminum | Bowls | 1/4" (6.5 mm) plug | $595 |
Question:
How many headphone classes have a US MSRP of $150?
Answer:
1.0