A great student metal detector! It is very simple and easy to use, it has an auto tune feature with a meter indication to show metal types detected. It is very reliable with its micro-processor control and digital signal processing. The detector has an adjustable length boom and a waterproof search coil making it suitable for use in a variety of landscapes. It is capable of detecting a coin at 100mm deep and responding to all types of metals. 

Features:

• Volume and sensitivity adjustment knobs
• Audible alert speaker
• Headphone socket
• Overall length: 780mm
• Search Coil Dimensions: 165(Dia) x 17 (H)mm
• Requires 6 x AA Batteries (SB2424, SB2425, SB2900, SB2902)