Advise Zain on any claim misrepresentation

Davina has just bought a wholesale batch of electronic telephone/computer routers from a large retail chain. She bought them cheaply because they were customer returns. Davina is attempting to sell 10 of them to Zain, a network installer, for £25 each and Davina tells him:
(a) “they should have a wireless range of 100m”;
(b) “they work on the a/b and n wireless frequencies, you can check the specifications in the manual”;
(c) “they are all black plastic”. Zain buys 10 of the routers, but when he receives them he discovers that:
(i) the wireless range is 20m indoors;
(ii) the routers operate on frequencies a and b only, not n;
(iii) half of the routers are black, but the others are white. Advise Zain on any claim he may have in misrepresentation only.