Do you make the simple on/off wireless gizmos. Looking at then for the backpacks. Problem we had with ones we sourced was the following. A the pump would always switch on but the main problem was switching the pump off. Some times it would work but most times it wouldn't. If you kinked the hose. THEN pressed the off buttom pump would ALWAYS switch off. B Coz they are 2.4ghz they are same freq as doorbells. So we got interference. Also how much Thanks.