We are developing a telescopic product requiring custom compression springs. The spring must compress to 30cm length (35mm diameter) and extend to 1.5m length (26mm diameter on final section) with sufficient force to lock the system in extended position. The mechanism will consist of 5-6 telescoping sections. Please advise technical specifications and manufacturing feasibility. Require spring solution that maintains structural integrity through repeated extension/compression cycles. Material selection should prioritize durability and consistent force output.

Looking to purchase 1 unit of long range WiFi transmitter/extender for demo purposes. Product requirements:
- 2.4GHz frequency with 300Mbps speed
- Outdoor deployment capability
- Integrated 14dbi antenna
- AP/hotspot functionality

Please provide:
1. Unit price for single quantity purchase
2. Detailed product specifications
3. Available purchase channels
4. Demo support information