6 USE IT! Work in pairs. You want to buy a present for a friend. Compare these products and decide which one you'll buy. Use the key phrases and the dialogue in exercise 1 to help you. TEMS WATER CLOCK £19.99 No need for batteries. This clock works using water! Colours: red, silver, blue WIND-UP RADIO £35.50 No need for batteries. Wind this radio up for one minute to listen for twenty minutes. Colours: black and white, grey ​