Untested, sold as junk. No transmitter. Receiver only. The main unit has yellowing, discoloration, dirt, and blue rust. ELPA wireless intercom set. SBS-34 and SBS-30 set. - Brand: ELPA - Model Name: SBS-34 - Model Name: SBS-30 - Features: Wireless communication function - Power supply: 4 x AA batteries. Batteries are not included. Thank you for viewing.